One stick of Nanya 256Mb DDR2 SO-DIMM for sale.
Used for a few hours after my Dell 1300 laptop arrived.
This is a PC4200 (533Mhz speed) although it will run at PC3200 (400Mhz) speed in most laptops as well.
Ideal if you've just bought a cheap laptop with only 256Mb of RAM ....
(references available as I've such a low post count)