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freecycle, the only problem was they didn't have any envelopes. I have used many of them, stealing envelopes from other cards or making them into postcards (another post for another day). It took making thank-you notes with Chiquita to realize that I could make my own envelopes!
All you need is:
I just folded the bottom up and glued along the sides. In retrospect I could have made flaps, but the less complicated the better for me.
To make sure the address was legible I just added an address label a slightly smaller return address label. Then I slide in the card and glued down the flap. Add a stamp and mail!