Now available at the Summerwine shop. I saw it on twitter. No idea of price but thought I'd share
They were selling the hats at the 50th do, about a tenner I thinkI haven't looked yet at the retail price but I'm tempted just for the hat alone
The original hat was knitted by a dedicated watcher. So for anyone who knits, there should be pattern somewhere. So if anyone should be so inclined, with a pattern and a little bit of yarn, they can come up with a reasonable copy.