Try leeching fc's like "sell dung" or "dunge leech" they usually have maxed keyers so you'll find one every now and then, hex has starting bid of 25mil and blood neck starts at 5mil hope this helps
For the binds you are looking for, the iDung guide here http://www.sythe.org/showthread.php?t=1455571 recommends using fc's like "sell dung" and have them do specific floors where your binds will appear. Make sure you make them aware that you want a specific item though or they make grab it for themselves.
Also, if you can't be bothered, there are settings on iDungeon that allow it to look for binds and replace them over one of your current binds.