Reddit reviews Yens 4" x 7" #0000 Kraft Bubble Padded Envelopes Mailers Self-Sealing, 500 Piece
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Product: Kraft bubble mailerSelf sealing: just peel and stickInside: 4 x 6 + 1.5 flap
#0000 4x6 bubble mailer. You can get them in bulk online or a 10-pack at wal-mart, depending on the volume you plan on doing. I do recommend using the toploader or something similar for the cards, though, or they might bend. The link I sent you to puts them at around 5.2 cents each (excluding taxes).
Edit: Some people use polymailers. They are the same thing, but plastic. It helps in case they get left out in the rain/snow for some reason.