I have a matching pair of 256mb Geil Ultra Series PC3200 (DDR400) DIMMS.
Newegg is currently carrying them for $65 each but you can snag them from me for $50 each or $45ea for the pair. USPS Parcel Post shipping is free, or + $3 for Priority Mail anywhere in the 50 States. Canada, yes, you're included, but shipping is price + actual shipping via USPS. Paypal is accepted, but tack on an extra $0.30 to defray the fees. I also accept personal check, cashiers check/money order. Personal checks must clear before I'll ship.
Yes, these are G5 compatable.