I got my R-400 directly from http://www.com-spec.com/R400/
they sell as falconry receiver.
It has all of 216, 217, 218, 219 , but no 220, 221
First I called them up, but they told me would not sell to me because I hunt with dog.
I order online for $500, book say $200 trade in for any receiver work or not, so I sent in my old CB scanner, I got $200 back.
I got R-400 for $299 , great bargain !