I believe the memory you need is PC2100/PC2700 DDR SDRAM DIMMs.
Also the maximum you can have in that comp is 2gb, so if I were you Id get two 1g sticks at best buy, or fry's and that should take care of the memory.

EDIT: You might wanna try Frys Electronics or Crucial though because this is all I could find at Best Buy.
http://www.bestbuy.com/site/olspage....c=abcat0500000