I've seen them listed on Craig's List too.
We still had the tow bar from our last Jeep and motorhome combo...but we needed to buy a base plate to fit the Jeep Liberty, and have it installed and STILL cost us a bundle!!! Anything in the Recreational line is overpriced IMHO!!
Our first RV in 1968 was a motorhome, so we've been towing since then....and only on the last set did we have the non-working Brake Buddy. I KNOW it's the law--- but I don't really admit that it is safer...We've traveled LOTS of mountainous regions..and never even came CLOSE to having a problem that we felt a WORKING Brake Buddy would have been helpful..
I guess it doesn't help my opinion that we paid a bundle for the Brake Buddy...It was new...and Camping World kept giving us other new ones....we ended up with a total of 3 of them., under warranty of course, ..and not a single one of them worked. That is rather off-setting!! Might be different if they were not so costly....but one feels you may be purchasing yet another pig in a poke!!
Happy RVing!
Joella