ive had a few grinders so far, but i get mine from a head shop so there only like 5-10 euros for one. i would recommend a wooden one they have a thighter fit so they stay together even if you drop it while grinding, i had a golf ball one that was magnetized and it wasnt bad i juss threw in my golf bag to hide it, easy enough. but i have seen grinders that are made so u grind the bud so fine that u only get the powder, so smoth btw. but those are like normal grinders with a thin screen at the bottom that goes to a bottom that comes off. but me i i juss grind it into powder.

but hey do yall mix your bud with tobacco?
over here we do and sometimes i grind both, ive never had a better j haha
but good luck man, if your in a pince just use razor blades, that what i do right now.