i have never been offered keif for sale. i didn't even know people did that. i wouldn't even buy it unless i already smoked it because in my opinion there are 2 types of keif: the kind that burns like regular weed and the kind that melts into a bubbling glob. if it doesn't melt it's really not much more than weed powder and in my opinion sucks. i would have no way of knowing in advance because it all looks different depending on the weed it came from. i have only smoked keif from my keif catching grinder, but there are still different grades if you ask me, and i've had some not-so-impressive weed make some killer keif and vice versa. it's just too uncertain for me to even price.