To the OP-- Wally World has the adapters.
I agree, get one.
I've seen CGs in WV with only 50 on some posts.
Also stayed at a private CG in MO that had both kinds but the site
we wanted had only 50.
The owner offered us a loaner adapter with no deposit but I wanted
to use my brand new adapter
So to chime in with the rest, yeah, they're out there.