Darkv and I recently made two new grinders, a 20 spawner skeleton and pigzombie and a 17 spawner iron grinder.
Here are some photos of the grinder, and the spawner placement;
The prices for each grinder is;
Skelly/pigman: 30k for a regular sethome and there are also ranks.
Iron: 30k again, this currently has no ranks, but if it gets popular then I will probably put some in.
Please leave a reply here, msg, or mail me ingame.