So I currently have the quest that requires 10 each of laser sword, blaster, and plasma rifle. They now drop out of every room pretty frequently. I'm pretty sure that once I finish the quest, they will not drop that much. What I've been doing now is wait til I have 7 or 8 of each one, them go visit people and use them all up, collecting lots of alien stuff. Seems like a good strategy that is working out well and wanted to share. Wish I thought about this with a lot of earlier quests!