does anyone know of any place i can get a used tire for cheap?

i'm looking for a 205/40/17 and every place i call either doesn't have them or wants around $50 for a used one, i just need somethin to gimp along until i get new ones, because i'm going 10 wider and 10 taller on my next set, and theres no use buying a new one

so any suggestions you guys got would be greatly appreciated, o preferably in the Brandon area, but, Tampa would be fine too, i just dont wanna go too far