Gunnar Street Dog, Bianchi Pista, ****ty Road Conversion, Fit Van Homan BMX
Cheapest way is to just take off the derailers and one of the chainrings (you'll need shorter chainring bolts). Then just loop the chain around which ever cog in the rear gives you the best chainline. This is the super ghetto way to do it. Otherwise, get a wheel with a flip flop hub.