This deal has ended.
Buy.com has 1GB Crucial Laptop RAM Memory (333Mhz 200-pin DDR SODIMM) on sale for $18.99 after this $40 mail-in rebate (through 9/18). You'll have to install this into your computer yourself (or have a tech-savvy friend do it), but it's a great price for for a gigabyte. Were you to upgrade at Dell or HP while building a notebook, this could cost upwards of $50. Shipping is free and there is no sales tax (except CA, MA, MD, TN).