You can do like I did and build your own... or you can spend a ton of money and buy one of the commercially available units.

There are several, the I4C isolator is closest in function to the one I made and then of course there are the the Emcotech and Powerbuss Pro http://www.rcuniverse.com/forum/Emco...1635038/tm.htm and several other that I can't think of right off the top of my head.

This thread has a pic of the buss I made...

http://www.rcuniverse.com/forum/m_13...tm.htm#1362193