Collectors looking for hand signed limited editions and open edition prints can find them over in my shop on Etsy. Availabliity is limited and select. Everything in this shop ships direct from my studio. Orders over $35 ship for free in the US, and most orders ship out in under 24 hours M-F.
Looking for prints in various sizes with various surfaces options? (paper, canvas, metal, acrylic, etc.) The largest and best selection is available at Pixels (Fine Art America Company). These are made to order and ship direct from the company. You'll also find a few other goodies there like totes, towels, pillows, and other home goods.
Another print option is Art.com. The selection there is more limited, but they still have 300+ to chose from, and bonus - you can often find coupon codes :)
I am a bit of a t-shirt junkie, and I just like to wear the art sometimes. The selection here is slim compared to wall art, but new designs do pop up every so often when I get inspired. All shirts are made to order and ship from TeePublic.