Welcome Brenda. Just keep watching the classified ads here, and maybe contact Tammy at Escape Trailer. Sometimes there is someone who is buying a new/larger one and has a 17 to sell that Tammy knows about.
The A's are a bit harder to find than B's. You can also look at the FiberglassRV.com classifieds.
Eric (and Mary who is in no way responsible for anything stupid I post)