Forum:What is THE best way to find Pearlescent weapons?

So I have killed Crawmerax at least 150 times as a soldier, with no luck at all. I have killed him online, offline and in splitscreen and have yet to find a Pearl myself. I want to know - what is the most effective way of finding Pearls, who is most likely to drop and all other variables. Please message back here or contact me via PSN (lbpomg95).