I looked around for you, didn't find anything (even locally!)
I lost my favorite Callaway visor, I was cleaning my spikes/clubs before loading them into the car, I was sweating and I didn't want my visor to get soaked, so I hung it on my passenger-side-view mirror, and I actually said to myself, "YOU'RE GOING TO FORGET THIS HERE...DON'T FORGET THIS HERE!" Obviously I forgot it, and they're nowhere to be found anymore. I feel for you dude.
I doubt I'm going to think of anywhere online you haven't looked, but I tried. Good luck!
I hate when that happens! I've got a growing collection of hats that I take care of as if they were my children. I lost my favorite short-sleeve rain jacket some how and haven't found a good replacement yet.
As far as your hat, I've never seen that type. Good luck finding a new one.
I checked out my local golf shops with no luck. I guess that doesn't do you any good. I once lost my favorite hat on a boat and was never able to replace it. Flew off my head into the ocean never to be seen again. Hopefully you don't have the same luck.