Well... it looks like the ones I bought in 2015 are no longer available:
RA Vision Gear titanium non polarized for $99 (bought it specifically for my 1st F80’s HUD)
Guess they were too priced too well and the company went out of business. Their video of dropping a watermelon with these sunglasses on out the window of an airplane to show their indestructibility is still up on youTube: