Chopper,
You can pick up inert pinapple grenades all day long at army-navy surplus stores for 6 to 8 bucks....I've got about 10 of 'em lying around (I use them in my WW2 reenacting hobby)...and, they already have a hole in the bottom!:)
Ebay is full of shrunken heads for sale, from 3 bucks to...