Thanks for the info, Jennifer and Seedfork. The coin envelopes that Uline has are 2 1/2 in X 3 1/2 in , 500 for $13. They have bigger sizes for a few $ more. I didn't think that was such a bad price. They are the brown color but also have white ones. Not sure what size I would want. I doubt that I would ever use 500 envelopes but you never know.
Thanks for your help.