Yea A/C!!

I would assume with the flash cards, one could submit them to a publisher, one that is known for publishing those types; print & package them oneself, in standard postcard size that shouldn't be too complicated; or, see if somewhere like cafepress.com has a blank set which you can set up with your designs. I don't think they do, as you'd have to do a different product for each card. Maybe check with a playing card manufacturer. Also, check with any specialty advertising company.

Good luck, that sounds neat!