does anyone know of a custom wheelbuilder that does powertap rearwheels?

Everyone seems to sell them as sets (at least on their sites) psimet, november, williams, etc... I am hoping to get a 50-58mm carbon clincher on a pro+ hub for ~ $1200 (hopefully less) which seems ballpark since the powertap sets are between roughly 1600 and 1700.

Gonna email november about it tommorrow, but they are out of rims for the time being anyway.