I wound ordering direct through Amazon. The prices fluctuate and I bought when they were $10.32 each. so $82.56 total, free shipping with Prime. If you have Prime I don't really see how you would order elsewhere unless the price was much lower and you had dealt with the seller before.
08 E90 | Jet Black / Black | 6MT
Mods: RAC RG63 w/ Pirelli Corsa 255F/285R | Akrapovic Evo Exhaust | OEM Blacklines
Winter Setup: OEM 18s w/ Nokian Hakkapeliita R 245/40-18