you might try these guys
http://www.milehighwings.com/
http://simblaster.com/
http://www.micro-gadget.com/RC-Gadget.aspx

you might also just try a male to male 3.5mm headphone cord and use ppjoy. It might just be as easy as that.

My LHS said eflite is supposed to release sim cords for the heli's at the end of april... lol yeah right! they should be working on them though, and they might be out sometime in the near future. My LHS said they would only run 10 bucks