Original prints and drawings
if you like things a bit more limited I sell editions via The Art Hound Gallery
thearthoundgallery.com/collections/alan-rogerson

And for some less limited prints and greeting cards.
www.alansartkiosk.com

Digital printed things
I use Redbuble to sell my illustrations on cards, posters, t-shirts, phone cases and lots of other stuff.
www.redbubble.com/people/baggelboy/portfolio