Chop shop in Reno, the gun shop in Reno (the back, you have to sneak), Navarro etc. there are quite a few around, but they're more fun to kill people with then giving it away.
Kill Tubby in the Den and he usually has them.......sometimes Flick does too.........since i go there before Klamath i get weapons , armor and anything else i need to do Klamath quests.....then you just have to get that punk kid to tell you where the wrench is at VC.....Smitty has them too sometimes in his lockers.