Ral Partha do resin treasure piles (Coritani and Scotia Gendel also sell them).
Fenris Games or Ainsty Castings will have a range of boxes, barrels, chests etc.
Just looked through my bits box and I have a small ziplock back full of plastic and metal things for scatter terrain. I've got:
Books, scrolls (open and rolled), skulls on chains, religious symbols, sand timers, armour pieces and helms, 1- and 2-handed weapons, crossbows, pistols, shields, bottles, beer mugs, pipes, quivers (arrow and quarrell), pouches, those Reaper Bones candelabras and a Bones Mimic (a treasure chest with TEETH!), undead bits including a bag of skills and several bags of body parts (don't ask), and finally several dead guys.
Oh and a small pentagram and a dead boar.
Give me a yell if want a handful dropping in the post.