Corsair has a very nice deal on a notebook memory. You can get yourself CORSAIR ValueSelect 2GB (2 x 1GB) 200-Pin DDR2 SO-DIMM DDR2 667 (PC2 5300) Dual Channel Kit Notebook Memory – Retail for just $130.
This is nothing compared with what you use to play for 2 GB of SO-DIMM notebook memory. A few months ago you would pay almost three times the price.
If you have a notebook with 512 MB or 1024 MB of memory this is a chance for you and it supports all the current Centrino platforms, out in the wild. Don’t be fooled by DDR2-667 this is as fast as Centrino goes these days and of course this memory will work as DDR2-533 or even DDR2-400 depends on your notebook motherboard.
You can grab one here.