If you use dungeon tiles and minis in your RPG games, you'll want to check out dxContent's custom tile service (http://goo.gl/nsS3x) (and FAQ (http://goo.gl/DKdFy)). We can manufacture precision, machine cut tiles in any shape you need complete with suitable graphics (even your own graphics). Its perfect for boss rooms, recurring locations or even complete dungeon tile kits.
dxContent.com (http://www.dxcontent.com)
FYI - prototypes on auction at ebay (http://www.ebay.com/itm/40pc-Dungeon-Tile-set-RPG-games-like-D-D-Pathfinder-/221167346726)