from my experience... there is no better monster to kill than flesh crawlers. Especially as people kill them for ranarrs and higher level herbs, so they leave all the guams, maras, tarromins, haralanders on the floor! these are the ones you want. They're low level, and you can find them on level 2 of the stronghold of security :) Id advise you go there on a busy world, fill up your invent with any you can find, keep the higher, more expensive ones to sell for gold to buy more. (ranarrs and snapdragons sell for 7k+)