I googled it and found lots of them for sale on EBay and other places. Prices in the $15 to $20 range.
One interesting note. A fellow on EBay who has some for sale says he will send you a data sheet and pinout if you email him at: email@example.com
It appears to be a surplus shop in St. Louis MO.
Just ask him for the data sheet for the switch he has on EBay.
It is listed as DC - 3 gHz so the frequency range is fine but I wonder what the power handling capabilities are. Those little SMA connectors do not impress me.
Please come back and let us know what you find out.
Clint - W5CPT