Titanium has kind of fallen out of favor since the latest aluminum and carbon fiber bikes have come around. These newer bikes are finally as light or slightly lighter than Ti, at a more approachable price point. That being said, I have seen some good deals this year on Ti bikes whose owners were being drawn to the latest-greatest. I have seen several respectable Ti road and mountain bikes selling for $700-1300. Personally, I think anyone who would give up one of these bikes for a soda can or fishing rod is kinda nutty, or highly vulnerable to marketing. But their loss is my gain.
I picked up two used Ti bikes this year at a small fraction of their original price: a One-Off handbuilt Ti road bike (even with a Ti fork) and a Miyata Ti MTB. They are both rare, awesome, fun, and equal to bikes costing much more.