I have no "art" except my own, but I don't have any place to hang it anyway so it doesn't matter.
If you are looking for interesting pieces but you're on a budget, try buying from art students...someone offered to buy an oil pastel I did once after they saw it in a school art show, but I didn't sell it because I would've only been able to get minimum wage times the number of hours I spent on it, which wouldn't have been enough to entice me to part with it. OK, so you probably won't find world-class caliber stuff, but if you're just looking for pieces to decorate with and whatnot, that might be the way to go until you can upgrade.