I have recently switched out some RAM for my old MacPro 1,1 (2006) computer. That has left me with 8 sticks of 512MB (so 4GB total) of Apple-original memory modules. These are the extremely well made ones with large heat dispersion fins and were all working when I pulled them.
240-PIN DDR2 FB-DIMM PC2 667MHz
I doubt they are worth the trouble of selling on eBay, so they are free to a good home for just the actual shipping.
Adam