There's also an identical EAA discount, if one doesn't "do" AOPA for whatever reasons.
Sorry to hear they merged, so much for competition...
One local testing facility had the ability to do a local discount as well... how they were doing that, I don't know... but they liked cash, and said they had no way to run credit cards locally, but could accept cash payments.
Probably had something to do with me doing CFI stuff... they likely lose a little more money hoping CFIs will send business their way.
I didn't want to tell them that they're the only facility with reasonable hours within an hour drive, and two if it's rush hour... so they're going to get the vast majority of the business at the airport anyway, and their ups and downs are completely tied to the economy and student-starts.
But got to know two of the proctors fairly well as acquaintances, considering the number of tests I took back-to-back. Nice folks. They keep a few desks open in their office for impromptu FAA walk-ins and the rest of the day they're testing for all sorts of other things, IT cert tests, real-estate tests, whatever... you name it... they had a massive catalog of stuff. Always a few people in there taking some sort of test.
The FAA stuff, the guy said the rules are tight enough that they didn't like to reconfigure the "stuff on the desks" too much unless they had a glut of real-estate or some large group come in, so they kept the FAA desks set up in one corner of the facility's three rooms.