Upgrade your MacBook Pro, iMac to 8GB of RAM for $45

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:

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