Nice page! They have the Sturmey Archer 8-speed disc-brake-ready model for £120, which is $190. Plus you pay shipping. Looks like a good deal, and it's SA instead of Shimano. Gear steps are 14% except for the two steps at the ends. Not bad. You'll need a tiny chainring, though, because it's designed for small-wheel bikes.

[h=1]Sturmey Archer X-RK8(W) 8Spd Aluminium Hub with Attachment to Accept Disc Brake - 36 Hole[/h]