1XRun is a recent site I came across that sells affordable prints. The catch is that you need to buy them before the week is up. Otherwise, they are gone forever.
I was able to get a DABS MYLA print and can't wait to see it!
Another piece you all should look into is the ASKEW (MSK/AWR) print made in honor of REVOK who was currently arrested and accrued huge legal bills. Another respected LA artist targeted in this war against grafitti and street artists, the art community has gotten together to stand by this man who have been for years been putting the city on the map.