You can do much better for yourself buying an old 80s roadbike from a pawnshop, where due to it's age and that they are snapped up and resold to pawnshops by junk dealers the bike probably isn't stolen. (new [real] bike at a pawn shop? dont buy unless stolen goods are what you prefer)
They run $20 to $35 and are in various states of dirty and disrepair, but you can find one you like, in person, buy it and spend a hundred bucks on the budget stuff this knob buys bulk (cheap cogs & lockrings) and redish it yourself or at your LBS. Several of his customers have complained about the poor sad work he does redishing it.

The guy is a glorified junk dealer cashing in on a trend. It's a fine trend, find yourself a fixie cause you'll enjoy it, but this fellow is just a scrapyard dog.