Nearly new (maybe 200 miles at most) Shimano 105 RD-6500 medium cage derailleur $35
This came on a leftover Jamis Xenith Endura that was upgraded to a larger 32T cassette which required a new derailleur with more chain wrap capacity. Basicall
Almost new Shimano Hyper Glide 5600 cassette with 12/27 tooth range. $25 includes shipping in the US only
Has 200 miles at most before it was replaced with a bigger 32T cassette. Tons of miles/years left on this cassette and still looks like