Reaper Miniatures, currently one of the top (if not the top) manufacturers of metal minis for RPGs, is getting into the pre-painted plastics business, starting in early August. The first wave of releases is a pretty generic batch of fantasy monsters -- and I'm annoyed 'cause I bought the unpainted metal version of that ogre chieftain just a few months ago! (Grr!)
Oh well. :) Any good source of reasonably cheap, nonrandom, prepainted minis is a good source in my book!