Tonight I bought a Dynacraft Triax Crimson purchased for $37.48 at Target. Sure it's garbage, but for the price it can make a fun beater fixie if I don't invest too much money in it. For less than forty bucks, I got an aluminum frame with looooooong horizontal drops and a seven speed freewheel...not a cassette. A little Locktite, cog and BB lockring, and I'm in business.

Mine's like this, but with even more fugly decals.