The discount at the Classic Center is one component; the advertisements for various vendors that specialize in all things Mercedes is invaluable as well--they appear in the 6x per year Star Magazine (to which I contribute every now and then). When I "got" my Pagoda (i.e. rescued it and shipped it to the restorer) the first thing I did was join, just for The Star, and found--some years before this group existed--all the usual vendors that helped out.