as a for instance a gm arm would probably cost more than hes quoted you total,parts off e bay could come from anywhere or be counterfeit,real easy to supply parts cheap when theyre substandard!i wouldnt slate him for buying one from a local supplier but that would obviously be dearer than the cheapest firm on the internet,if theres any problems with it he has a physical entity to take it up with and/or replace it.not the case with some mythical company from taiwan or similar.i still reckon his quote is in the ballpark.