Staples have loads of memory on sale besides the 256MB PC2100:

Add Items: 499682 PNY 256MB PC2100 and Item: 399774; need to reach $50 for free shipping and coupon to work

-$10 (coupon code: 23700)
-$30 rebate

Final Price: ~ 10.13 + tax :-)

*obviously you can choose something different than the lead refills...just need it to be greater than $2.06