This product is either discontinued or we cannot get that from suppliers.
G.SKILL FA-8500CL7S-4GBSQ, Capacity 4GB, 204-Pin DDR3 SO-DIMM, For Apple Notebook, Speed DDR3 1066 (PC3 8500), Cas Latency 7, 1.5V.
Designed for Apple’s Mac systems, the G.SKILL DDR3 SO-DIMM for Mac series is hand-tested for compatibility, reliability, and stability - all in the G.SKILL memory tradition.