The clock was ticking. I had fifty hand-lettered invitations and exactly zero envelopes to put them in. A7 envelopes—the standard 5.25" x 7.25" size for 5x7 cards—are a staple, but finding them in person can be a scavenger hunt.

Look for their "Invitation" envelope section. They often carry "Invitation" labels rather than just "A7."

Usually the most reliable. Check the "Mailing & Shipping" aisle for 50-count packs.

Hit-or-miss. Check the office supply section, but they often only carry standard #10 business envelopes or smaller A2 sizes.