Basically this, but not Corsair brand, and 2x2GB instead of 2x4GB. Should work in any newish Mac but you're responsible for checking compatibility. These came out of my 2011 iMac 27".
[VIDEO]http://www.amazon.com/Corsair-1333mhz-PC3-10666-204-pin-CMSO8GX3M2A1333C9/dp/B002YUF8ZG/?tag=vglnk-c1015-20]Amazon.com: Corsair 8GB 1333mhz PC3-10666 204-pin DDR3 SODIMM Laptop Memory Kit CMSO8GX3M2A1333C9: Electronics[/VIDEO]
$15 shipped Priority CONUS.
I have some of these too, and I'll sell them for $14.
GET FUCKED SOOP