My wife is an artist. She has a long standing daily practice of doing a drawing and posting it online at https://eyespider.wordpress.com/. She's looking for a simple way to make it possible for people to buy the originals or to contribute to help defray her expenses. She's not interested in doing prints, and wants to make the originals cheap, $20 and up. She's looking for the easiest system, both for her and her viewers. Doesn't have to be on Wordpress, but she's happy enough there otherwise. Click a button by a picture, takes you to an address form and maybe a PayPal link, and also marks that picture as sold. Something like that. Any suggestions?