Still sounds cheap, but hey, if he's got a good reputation, get it done there. I think I paid ~ $1,300 for everything for my front ARB and ~$700 for my Detroit tru-trac rear locker.
Everything was done top notch and it was worth every penny. Sometimes I get into some really nasty stuff and even with both rears locked, just barely get home. I can't even comprehend working w/o at a minimum having 4WD.