If only you could manage a little more money, you can get a brand new fixie. So why stick to the repair thing ? Have you tried Amazon.com? For a little above 210 dollars, you can easily get a great 'value for money bike. I recommend one that I got my hands on recently. Its a hand crafted bicycle with a strong, tig-welded steel frame that makes it ideal for riding around just about anywhere. It has a set of strong ‘Wanda’ tires, KMC chain, and Promax brakes.
Choose from among various designs of single speed/fixed gear fixie at Cheap Fixed Gear Bicycles