i know a couple of RVer's that are CFI's and will do it for nothing. Part of our Fraternity I guess.
I guess I've had 8 or so BFR's over the years. I remember paying for one of 'em. I've had free ones from CFI's who just wanted a little RV time, same thing with a Lockheed test pilot. And then there are a couple of my friends who are CFI's and give good, free BFR's just to make sure their friends are flying smart and using good stick and rudder skills.