Roll my own...?

Having done a bit of transmission research here and on Bikeforums I got BJ to factory fit the only bits I wasn't happy to DIY i.e. bottom bracket and threaded headset. They charge nothing to do it for you apart from cost of parts.

It is not surprising that they should charge you nothing, putting that BB in involves little more than a bit of grease in the right places and screwing in two 'cups', once you know what you are doing you could install a BB in 5 minutes - and I am sure some could do it in less.

its really just screwing stuff together, and turning it the right way, and hard enough with out turning too hard.

+1

Basically - what Chris said.