From 9to5toys.com:

Amazon offers the Corsair 8GB (2x4GB) PC3-10666 DDR3-1333 SO-DIMM 204-Pin Dual Channel Notebook Memory Kit, model no. CMSO8GX3M2A1333C9, for $54.99.99 with free shipping. The $10 mail-in rebate cuts it to $44.99.

The 8GB (2 X 4GB) DDR3 Laptop Memory Kit is 1333MHz Unbuffered CL 9 SODIMM Memory 9-9-9-24 1.5V which matches recent iMac and MacBook Pro Specs. Commenters at Amazon concur.

Got a 2009-2010 model? Even better, save an additional $5

Apple charges 4X that for an 8GB upgrade:

I purchased this for my (Early 2011) i7 Macbook Pro. Apple charges $200+ for the upgrade and you lose the ability to sell your stock memory. I replaced my 4GB with this 8GB kit and sold my 4GB for $40. so in essence i got this for … man oh man.. what a deal! Works well and the difference in video editing and running multiple apps is noticeable.

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