I'm thinking about getting one.
Nitro rcx sells RCs cheap.
Make sure you find out if the helicopter you're look at buying will support the extra weight of a camera... since you also asked about a camera for a helicopter. ;)
My friend has the rc helicopter but we dont know if an itouch will fit on it. My friend's user name is jamngary if you want to ask him what type he has
Just get the approximate weight of the camera you want to use and with a string, hand something of similar weight to the helicopter and see if it'll still fly. That's your quickest way of finding out.
Here is a good place to start looking: http://www.dealextreme.com/c/r-c-helicopters-840?page=1&pagesize=52&pagesort=relevance