I guess I'll start this. Clearing out some stuff in my parts box I don't need anymore. Let me know if anything catches your eye.
Chain guard I had on one of my commuters. Probably more appealing to you MTBers.
130 BCD, 50T.
A pair of Shimano Sora R317 disc brake calipers. Only one has been used, the other is still new in the box. The used one still has plenty of brake left on its pads.