I have seen some real head scratchers on eBay. Horns that make me say "WHY?"
I also have found some great deals there. I bought a Courtois large bore horn (Balanced model) that played like a dream. The poster said that it needed some valve work and was banged up. I bid with a max of 150 and got it for under 125. Imagine my surprise when the "valve work" was to re-assemble the first valve piston and lubricate the valves. The valves worked great, I freed the slides, and for under 150 I had a great trumpet. I subsequently traded it in on a Recording. I like the Recording, but I miss that Courtois like you wouldn't believe.