If you're a member of the MBCA (mercedes benz club of america most dealers will give you a 10% or more discount on parts. By far the best discount is from Tom Hanson at Caliber Motors in CA. 800-252-6877. I have paid for my membership many times over with that discount.
'87 300TD 304kmi (RIP)
'95 Toyota Camry Wagon 125kmi