I read on the wiki for this game that the pearls have higher chances to drop from human bad#ss enemies. If it's true where is the best place that you don't need an active mission, like the slaughter dome to farm them, since I finished all my missions
I haven't been there yet, but the pyro pete's bar brawl should be crawling with them if the previous playthroughs are any indication. --- Gamer for life, 31 years and counting. A life without video games is not a life worth living.