I agree with RJ regarding programmable parts like PICs or even insertable chips, but with static parts like sockets, capacitors, rectifiers, power adapters, LEDs, etc.. I think having an alternate brand is a good idea. Especially for guys like me who can read a spec sheet, but still not understand it and definitely not be able to pick an alternate with confidence. Maybe we are just in a bad time slot where things are short and this won't happen again, but then again.......