20x200 is a GREAT website that offers two different pieces of artwork each week. One photograph and one "work on paper" as they call it.
They run three different editions of each piece at three different price points:
200 small prints @ $20.00 each
20 medium prints @ $200.00 each
2 large prints @ $2,000.00 each
They are pretty varied as far as the style and subject matter; I always enjoy looking at the different pieces that are being featured that week. I haven't purchased anything yet, mostly because I am always too late to get the ones I really like (plus the fact that I am selling my house, so it's not like I would even have anywhere to hang them).
I like their website and concept, regardless. Go check it out.