Here is a brand new Automatic RF switch. It is supposed to be very rare.
http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... 0035916283
The cost is $2.95 and $7 shipping.
It is not mine, but I have bought two from him already. They arrive quickly and in brand new condition.
If you miss that one, not to worry as he appears to have a entire case of them, from the bankruptcy auction I think. He only posts one at a time though.