<A HREF="http://shop3.outpost.com/product/3308112/" target="_new">Here.</A>
If your mobo does not support PC1066 you should get the PC800-40 / PC800A. now found on pricewatch.
PC1066 can be found on pricewatch too if you search for PC1066 but be warned that if your mobo does not support PC1066 you might run into problems.
You are limited to what your mind can perceive.