Are you planing on using liquid light and printing them yourself in a dark room, or using an ink printer? It seems like if you had a commercial printer do it, it might cost you more than people would be willing to pay (I'm guessing based on the cost of a stretched canvas print... but i could be way off base). So, I guess my real question is, how much is production going to cost you?
I love the idea! I promise I won't steal it, but I am wondering how you came up with it, and how you plan to execute.
Oh, and to answer your question, I would probably pay $25 max, just because I can get canvas bags so cheap at the grocery store.