How to Choose Postcard Stamps for Business Promotions
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If you're mailing promotions, the right postage is a postcard-rate stamp, not a Forever stamp. Choosing postcard stamps for business mailings comes down to three things: matching the USPS postcard rate, keeping your card inside the size limits, and buying at the volume that actually saves you money. Get those right and every 500-piece drop costs less without a single trip to the counter.
Let's get the money part out of the way, then work through what qualifies, how to buy, and when a stamp stops being the cheapest option.
Postcard Stamp Cost in 2026
A postcard stamp pays the USPS domestic postcard rate, which sits below the First-Class letter (Forever) rate. As of the July 12, 2026 price change, the postcard rate is 65¢ and a Forever stamp is 82¢ (USPS, 2026). Confirm the current figure on the USPS Postal Explorer rate chart before you place a bulk order — postage changes twice a year, and the gap is the whole point.
That 17¢ difference sounds small. Mail 500 appointment reminders and it's $85 saved on one campaign. Do it monthly and you're leaving over a thousand dollars on the table by defaulting to Forever stamps.
Here's the trap most offices fall into. A staff member grabs the roll of Forever stamps sitting in the drawer, slaps one on a postcard, and it mails fine — USPS accepts it. You just overpaid 17¢ per piece for postage you didn't need. The postcard rate exists specifically for cards, and it's the cheapest legal way to send one.
Postcard Stamp vs Forever Stamp
Use a postcard stamp when the piece qualifies as a postcard. Use a Forever stamp when it doesn't — an oversized card, a heavier cardstock piece, or anything in an envelope jumps to the letter rate. The postcard stamp saves 17¢ each; the Forever stamp is your fallback when the card is too big for the discount.
| Scenario | Correct postage | 2026 rate |
|---|---|---|
| Standard 4"×6" promo card | Postcard stamp | 65¢ |
| Card over 6" long or 4.25" tall | Forever (letter rate) | 82¢ |
| Card in an envelope | Forever (letter rate) | 82¢ |
| Card thicker than 0.016" | Forever (letter rate) | 82¢ |
A postcard stamp is denominated for exactly this job. Our Postcard Forever Stamps hold their value through rate changes, so a card you bought stamps for last year still mails today without adding makeup postage — handy when you print a batch of thank-you cards and use them over several months.
USPS Postcard Size Rules
To get the lower rate, your card has to fit inside a specific window. Miss it by an eighth of an inch and USPS charges the letter rate instead. The requirements are unforgiving on purpose — automation equipment reads these cards at speed.
Qualifying postcard dimensions (USPS):
- Minimum: 3.5 inches high × 5 inches long
- Maximum: 4.25 inches high × 6 inches long
- Thickness: 0.007 to 0.016 inches
- Shape: rectangular, no rounded corners beyond 0.125 inch radius
A 4"×6" card — the most common promo size printers offer — sits comfortably inside the maximum. Go bigger, say a 5"×7" card, and it's no longer a postcard to USPS. It's a letter, and it needs letter postage plus it may hit a nonmachinable surcharge if the aspect ratio is off. Check dimensions with a ruler before ordering 2,000 of anything. The design that looks great at 5×7 quietly costs you 17¢ more per piece, every time.
How to Buy Postcard Stamps in Bulk
Postcard stamps come in a few formats, and the right one depends on how you apply them. Buying in bulk cuts handling time and, through the right channel, unit cost.
- Booklets/panes — small counts (20 per pane typical), fine for under 100 pieces a month.
- Coils/rolls — 100 per roll, the standard for hand-applying to a few hundred cards; the roll feeds cleanly and you're not peeling from a sheet.
- Bulk cases — thousands per order through a stamp supplier, best unit price when you mail consistently.
For "how much would 100 postcard stamps cost" — at the 65¢ rate that's $65 in face value. A roll of 100 is the usual answer for a small campaign. If you run promotions every month, buying wholesale postcard stamps in larger quantities beats restocking a roll at a time. For the full cost breakdown and use cases, our guide on postcard postage stamps walks through what each format actually runs.
One practical note: hand-applying stamps to 100 cards takes maybe 15 minutes. At 500, you'll feel it. That's the volume where you start asking whether a stamp is still the right tool — which is the next question.
When to Switch From Stamps
Stamps win until your volume makes applying them the bottleneck, or a bulk-rate discount beats the retail rate. Two thresholds matter: the labor point (around 500+ pieces per drop) and the discount point (500+ identical pieces qualifying for presorted rates).
Presorted and USPS Marketing Mail rates are the real lever, and no competitor page on this keyword mentions them. If you mail 500 or more identical postcards, presorting them by ZIP code and paying via a permit can drop your per-piece cost well below the single-stamp rate (USPS, 2025). You'll need a mailing permit, CASS-certified address list, and minimum-quantity compliance — worth it for recurring campaigns, overkill for a one-off.
Postage meters and PC Postage (Click-N-Ship, and USPS-approved vendors like Stamps.com) print exact postage on demand. A meter carries a monthly rental — often $15 to $50 — so the math only works past a certain volume:
| Monthly volume | Cheapest option | Why |
|---|---|---|
| Under 200 cards | Postcard stamps | No rental to absorb |
| 200–500 cards | Stamps or PC Postage | Depends on labor cost |
| 500+ cards | Presort permit or meter | Rental spreads thin; discounts kick in |
The breakeven is roughly this: if a meter costs $20/month, you need to save that $20 somewhere — in labor, or in rate discounts the meter unlocks. At 200 cards a month, $20 of rental adds 10¢ per piece on top of postage. Stamps stay cheaper. Cross into the high hundreds and the meter earns its keep.
One clarification worth making, because searchers conflate these. "Custom postcard stamps" from an approved vendor are real USPS postage printed with your logo — valid to mail. Self-inking "stamps" from a print shop like VistaPrint are rubber address stamps, not postage (VistaPrint, 2025). Don't buy the second expecting to mail with it.
FAQ
How much do USPS postcard stamps cost?
As of July 2026, a USPS domestic postcard stamp costs 65¢, compared to 82¢ for a First-Class Forever stamp. Verify the current rate on USPS Postal Explorer before bulk ordering, since postage adjusts twice yearly.
How many stamps do I need for a business envelope?
A standard business letter in a #10 envelope under one ounce needs one Forever stamp (82¢ in 2026). Envelopes never qualify for the postcard rate — that rate applies only to unenveloped cards within size limits.
What stamps do you use for postcards?
Use a postcard-rate stamp, denominated for the USPS postcard price. A Forever stamp works but overpays by 17¢ per card. Postcard Forever stamps keep their value through rate changes.
How much would 100 postcard stamps cost?
At the 2026 postcard rate of 65¢, 100 stamps carry $65 in face value. A roll of 100 is the standard format for small business campaigns and hand-application.
Choosing postcard stamps well is mostly about not overpaying — match the rate, stay inside the size window, and buy the format that fits your monthly volume. If you send local promotions, appointment reminders, or thank-you mailers, our Postcard Forever Stamps at Mailboxes of Flushing give you authenticated, inspected postage that holds its value between rate changes. Browse the collection to match a format to your next campaign.