Really? I was under the impression that the regulars in this thread would have considerably more.
Anyway, I didn't really set out to "collect" Holtons. Most of them were just horns I came across over the years, and they were interesting and the prices seemed right so I picked them up. A couple of the tenors I actually bought mainly for the mouthpieces that came with them. The only model I kind of actively looked for was a Wiedoeft, and as you can see, I have not yet succeeded in finding an actual Wiedoeft in playing condition (the post-Wiedoeft alto, however, I found to be a surprisingly good player). I've never run across one locally, and on the few occasions when I bid on one online that I liked I got outbid. I'm sure if I tried hard enough I'd find one, but so far it hasn't been a major priority for me.