I've got a 4 piece chromium crusher that i got offline for like $22 bucks a few years ago.
heres a site thats got them pretty cheap
http://weedgrinders420.com/chromium-crusher-grinder
its a real sold, well plated metal grinder. not sure what its made out of, i think like chrome plated nickel or something, but its a hell of a lot better than my friends shitty $50 aluminum one that grinds metal into your weed. Its also got a good weight to it. It just feels good in your hand, and mine hasnt lost its glamor after 3 years.
the keif screen is quiet fine on mine though, which gives a real nice fine powdered keif, but definitely takes a bit longer to build up.