Originally Posted by Analog

So, I know there have been threads about this in the past, but....
Does anyone know where I can actually get ahold of one of the fixed-gear cogs that bolts onto the standard 6-bolt iso disc rotor mount?

So...anyone know of a place that actually sells them, prefferrably online? I know I could take a regular cog to a machine shop and have them drill it, but the cost of doing so kind of defeats the purpose of the cog in the first place.
Thanks!