[Trebleclef]

Hi, my 07 318i needs a LCM due to reverse light failure. BMW have quoted 650 euro to replace. I got one on ebay for 100euro but this was faulty and reverse lights are still out. I've tried 2 other second hand LCMs from a local parts place and both were faulty. Now I've found another 2nd hand one from a dealer in Holland for 150euro but am wary as there is no return on electrical parts.
Anyone any similar experience? Do you think I should just grit my teeth and pay BMW the ridiculous amount for a new one? Thanks a lot