After deciding against my last bolt-on cog idea (the bike it was going on was just too sketchy), I have another one: I have a rigid 29er with an eccentric bottom bracket sitting around an is only missing a crankset, a partial cockpit, and a set of brakes. For a very small investment, this could make a very fun around-town fixed cruiser. Here's my question:

Who is making six bolt fixed cogs? I found VeloSolo and tomiCOG, but am I missing any? A VeloSolo cog with shipping would be almost $40, and to give you an idea of what I'm looking to spend on this build, I am currently eying a $49 front disc brake setup. It would be nice if I could find some less expensive options.