Blind Scorpio

Hi Everyone, I have an 2002 (E39) 535i, and I was wondering if anyone had any advice as to the best place to get a new bumper (without paying BMW prices). I'd prefer to get a genuine, 2nd hand bumper (the car has PDC and washers) but at a pinch I'd go with a new bumper, even though it won't be authentic (on that note, does anyone have an opinion on bumpers from DM Autoteile who sell on Ebay?) There are a few other bits I need, after an unfortunate and unavoidable coming together. Thanks