http://www.society6.com
http://www.threadless.com
http://www.e-junkie.com/
https://selz.com
http://www.redbubble.com/
http://www.inprnt.com/
http://fineartamerica.com/sell-art-online.html
http://www.designbyhumans.com/
https://www.teepublic.com/
http://pixels.com/
http://www.cafepress.co.uk/
https://crated.com/

Some guides/discussion/related :

http://www.reddit.com/r/artstore/
http://www.reddit.com/r/society6supportgroup/
Especially : http://www.reddit.com/r/artstore/comments/1vh4k9/a_tutorial_on_society6_what_they_dont_tell_you/
https://www.weasyl.com/journal/85616/thorough-breakdown-of-paypal-fees-18-content-addresses
Not a big thread but interesting : https://www.threadless.com/forum/post/974966/is_society6_making_you_earn_money/