I may be a little overboard with this but I keep a spreadsheet of the pipes I want. I rank them in order of most wanted and usually go back to the site and review them sometimes over a period of several months. If a pipe is still available after that period and manages to keep my eye for that same duration (and I have the funds) then I'll get it. Sometimes they get sold first, sometimes I just lose interest in them, sometimes I find something else that I find for less money that fits my collection where the one I was looking at did and in these cases they get deleted from my spreadsheet and I move on.
I had several Dunhills on my list but now I'm down to about 2 as I lost interest in the others. (Actually I have a third Dunhill but unless I get a massive increase in my income I'm not willing to spend the money on an Alphorn.)
As of late I've been all about unique artisan pipes. Here's number 1 on my list:
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Maybe next month if it's still available. Still unsure as it's a little more than I like to spend.