Get It Now From Newegg
Sandwiched between heat spreaders, the two Crucial Ballistix 1GB modules are rated at a speed of 800Mhz (PC2 6400), making them capable of transfering over 6 gigabytes a second. Perfect for overclocking.

Newegg just put them on sale for $64.99 - $40 mail-in rebate + $0 shipping = $24.99.