You could even do a Custom Bobber, Like GdCast said, for under a 1000, if youre savvy about where and how much you spend on parts. Oil cans and gas tanks, things of that nature can be substituted or built for much less than the average 600 a NEW tank on ebay. Ive seen Full on Bobbers use Coffee cans for oil tanks, like the one Im currently using for a glovebox under my seat. Be creative, think outside the box and DONT be afraid to ask questions! [Especially when it comes to torque and the size of your engine in ratio to your frame.]
Zombie