I bought a Pure Fix for a 150 bucks from a guy who had it , but didnt end up liking fixed gear. The bike cost 299 new. It was my first fixed gear. If you look around on craigslist you will find practically new fixed gear bikes that people are selling for one reason or another. I love it for 150 I was able to get my first fixed gear and get experience riding one.

So I now want a second fixed gear bike. I am going to try a SE Lager. The bike sells for around 400 bucks.
I buy and sell some vintage bikes and traded a vintage bike for the SE Lager to a bike shop that ordered one for me new, I will have it this week.

IF I wasnt able to trade for a new one, I would of bought another slightly used one. I saw a Big Shot on Craigslist for 250 that sells for about 400, that had less than 25 miles on it, I would of made an offer on that one for about 175. You have to have some mechanical skills when buying a used one, cause one of the reasons I think you find them for sale is, the guys or girls who bought them put them together slightly wrong lol and are not getting the performance they should get.

Good luck finding one