I think that it is event specific…
.
I sell Timex in my store (and use Timex watches) and I can;t even get one. 
As always, check Ebay. There are two up for bids currently that I found. Search for “Timex hats”
It’s a great hat. It’s made by Headsweats, and you can buy them by the bunch at www.headsweats.com. Choice of colors, too.
Just no “Timex” or “M-dot” logos.