Mac Pro :: RAM - Where To Unload It

I had a MP 2006 version and earlier this spring got an '08 version. Obviously, the '06 version that came standard with 2x512MB FB-DIMMs was under-powered so I got 2x1GB Netlist FD-DIMMS from OWC. When I got my '08 version I didn't want to put the 667MHz DIMMS in there with 800MHz stuff. For some reason, I was under the impression that I could get the $55 trade-in RAM rebate from OWC but they've said it only applies to the RAM that comes from Apple, not from third-party sellers...even themselves. So, that leaves me with 2x1GB FB DIMMS. There's nothing wrong with them at all but I'd like to hear from some others what a reasonable asking price is and where the best place to sell them is.