check
PriceWatch.com for some up-to-date figures...
I paid $50 for my 512 pc100/133 168pin sdram this summer...from pricewatch. it was old ram, from systems being liquidated at some company online.
newegg's sdram prices have been notoriously high. eBay has low prices too.
~Branson
*EDIT:
just checked pricewatch, and today (nov 3) they're selling 512mb PC 133 168pin sdram for $40USD.
if you're willing to make your friend pay $70, go for it...but know that a brand-new stick o' ram will only cost $40 at pricewatch.