Kim, many stores carry May Arts ribbons, however, they do not indentify them as such in their online stores, nor on the racks--ya' kinda hafta ask?
www.impressrubberstamps.com carries many May Arts ribbons in their store and you can order online from them (if you don't see it on their web store, they encourage you to call and ask for what you're looking for because there's waaaaaaaaay more stuff in the store than they can show online), but unless you are familiar with May Arts, you wouldn't know that unless you asked specifically . . .
HTH,