Cheap place to buy full color custom business cards

I made the graphics for a vertical 2x3.5inch business card for front and back in full color. The problem is, is that i do not know where i can find a reliable place to buy them from. I am guessing the minimum quanitity is about 250 so i would like to spend $20 or less if possible. Does anyone know of a place i can get cheap prints from?

mdj :}