I use a 9" Thai granite mortar & pestle simmilar to This
. Online $40 - $50 is what you'll pay, got mine in a Thai market for $19.00. I've also seen others like it in nearly every asian market I've shoppped and always for less then you'd pay anywhere else.
Yes it very heavy, I don't move it much or often, and for making things like chili paste where Galanga, Lemon grass, Kaffir lime leaf and rind are being worked with, it's nice to have one that will not move around, much.