You can easy get supply in black forest for that and for free just by being away from the computer (AFK).
Find a greydwarfnest (spawner) and first kill those that are there. Put up a workbench and block the spawner by building wooden floors under and around it.
Now pickaxe deep a sqaure 10x10 meters or so under and around it.
When your done doing that either fill your pit with fire or even better wolfs.
Make sure you even have a trench around the pit so the process will not be disturbed by any enemies.
Now let the process begin by taking away the wooden floorpanels. All the greydwarf will start spawn and falling into the pit and the wolfs getting the job done.
Go away and make some coffee or something and when you come back you will have plenty of loot.

If you want to go vanilla that is.