This one is on eBay right now.
Some of these are highly sought after (the one below is $180, although I think if you waited, you can find one for $125). But Ralph has come up with all sorts of great designs over the years. Some have just become collectibles in certain circles.
RL recently re-released their "Respect the Wilderness" cap. I think it retailed for $50 or $60. This was a few seasons ago.
View attachment 1440966
That one's nice too, but I'm a fly fisherman...I want the one with the trout on it!