Little Paper Planes; the only reason this great website isn't on the above list is because I've just discovered it myself! You'll of course not want to forget about two other online resources that you can sometimes find great affordable art on: Etsy and eBay. If you're in Austin and looking for local art in person first, a great place to start is the Austin Art Garage. Full of the freshest artists in Austin, prices are kept intentionally low so everyday people can invest in art. We recommend doing research in your own city to find a similar place for art.