$500 maybe? Even that is pushing it.
Hmm.....you may have to buy used then. Try here:
I am a Canon guy and so I am more familiar with the Canon gear. You can get a Canon 40d for about $350+ used. The 40D is considered a prosumer camera about 4 to 5 years ago. It has no video and it is only 10mp. However, it is a body I don't mind to have if I need a second body. With your budget, after the body, you may only have enough to buy one lens.