Originally Posted by
tskoe
Also, I was wondering if it was cheaper to convert to single speed or fixed gear because I am on a really tight budget.
It's easier to convert to single speed because you can still use your current rear wheel -- just get a single speed freewheel for it.
If you wanted to go to fixed, you'd need a new wheel built around a fixed gear hub, which has a lockring to prevent the fixed cog from unthreading.