Best places for parts, new and used

[Glacial Pace 12]

I need a few things for my soon to arrive M3, I'm going to do the rod bearings and have ordered bearings and bolts already, but I thought it might be better to get the bulky, cheaper stuff, engine mounts, gaskets, o rings, locally. Where would you go for this sort of stuff? 

It's also missing the front towing eye cover, hopefully this is something I can pick up used, who is good for this sort of thing? The colour is Space Grey Metallic so not exactly uncommon. Also does anyone know if this is M bumper specific or will any E9x one do the trick.