[align=center]I found this nice little grinder just laying around the house. It's originally a peppercorn grinder, but I washed it thoroughly and I used it to grind stems to make my own form of GD. It works perfectly and peppercorns are about as tough as cannabis seeds so it shouldn't have any problem grinding for you. It a glass bottle with a little plastic grinder cap on top and it cost maybe a couple dollars (if that). If you'd like a picture to know what to look for let me know.
[/align]