I would suggest E-Bay if you are careful and know what you are looking for. I found most used ones were being bid up within a couple of hundred of a new unit. I found one at a "buy now" price that I felt was fair and have been happy with my purchase. If you are in or near a large city then Craigslist seems to have quite a few of them listed, especially on west coast.
I used a Roadmaster Even Brake, same design as the Brake Buddy, borrowed from a friend for a 50 mile trip. Hadn't towed the car before so didn't know what to expect. It did seem to help with stopping. Our AC failed when it was 90 so we went home early. The MH AC doesn't do to well at cooling when the coach has gotten close to 100 inside. I didn't have the written directions, just verbal + the demo. Still don't know what I did wrong but when we got home and I went to park the car, the brake pedal went to the floor. The brake fluid had boiled. The tires had gotten so hot from the breaks dragging that the air pressure sensors in the front tires were melted. Didn't need new tires though.
That convinced me to get the Brake Master. It's faster and easier to connect, doesn't draw on the battery, and takes much less room to store. DW connects it while I do the tow bar. Also, there is a red light that comes on when ever the brakes come on.
FIRE UP wrote: You might consider "Ready Brake". It's an alternative that many people are very happy with.
Scott
X 2!!!
X3
You can get the towbar and braking system for less than $1k. I think it is a better system as it is passive and simple. Less to go wrong. It is also a "closed loop" system.
Dave
FMCA F298817
'83 Revcon Prince 31' FWD
502 w/Howell/Edelbrock MPFI, Thorley's & Magnaflows,
Koni FSD, Class A built for gear heads ?????? Revconeers Forum
There is nothing compassionate about taking someone elses money and giving to the poor.
Paid $600 and change for mine in 2002. Didn't know they had gone up that much!! just checked ebay and found 25 or 30 systems, seems to be 2 price ranges:
1. $900 to 1000+
2. $400 to 600
Don't know what the difference is but worth investigating.
Tom, Carole & Duke
Potter County PA (God's Country)
09' Phaeton 42'QRH, Suzuki SX4 Toad
I got lucky, I posted the same question two years ago, and someone PM me about selling me theirs for $300. They were getting out of MH'ing and was selling everything.
Couldn't have been happier with the way everything happen. Person sent the brake buddy to me with no money down. If I liked it, I would send a check, otherwise ship it back. I sent the check.
I purchased my brake buddy new and I am very pleased with it. Have had no trouble & has worked for me everytime I needed it. I'm on my third vehicle, this one being the heaviest. It is worth the money to have the extra brakes.
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Didn't need new tires though. 
