Here is a pic of mine. It's a Krups coffee grinder but works great for spices. Make sure you get a stainless steel
bowl to avoid the spices leaching into the plastic. You can get a number of different models from most stores for about $15-$20. Worth the money since I didn't want to keep using my dedicated coffe grinder.
When your done grinding you just tip over and your spices fall into the plastic top. Works fine for me.