Can't find the thread... but some time ago someone was looking for a way to allow customers to place online orders at a print shop. There are plenty of high-end options for commercial printers, but I just came across this:
http://dealfuel.com/seller/online-produ … gner-tool/
I don't even have a shop, or anything to sell...but I want it Anyway, it might be a good deal for someone here.

(I've bought from them before, never had any problems or issues)

That's a great deal considering the amount of time to code your own canvas app.

Pretty good. Here's another thought . . . http://codecanyon.net/item/js-php-product-designer/7652034

Thats the script I use for one of my sites. Fabric.js. Mine is a custom build on top of the kitchen sink.