This is a list of vendors I've stumbled across, and want to try out

1. Get your art printed and stretched on canvas at Easy Canvas Prints.

2. What is Envato Elements? It's a monthly subscription site, for royalty-free short audio and video clips.

3. TeePublic.com is a site that prints tee shirts, stickers and hoodies, giving Artists the ability to earn money by designing, uploading and selling products with their artwork on them. 

Another Tee shirt designer who sells his designs in a site called, VectorLab; here's an example.