Hey thanks (I'm the author)! BTW the "Pro" version has the electrochromic dimming, so I recommend paying a little extra for that unless you're really sure you're not going to need it.
EDIT: To clarify, I meant the "Xreal Air 2 Pro", not the "Xreal One Pro". The latter are much more expensive.
They are $299 on sale on the vendor website right now. I won't link because I don't want to promote them necessarily, but I think you must have seen a different vendor or something?
EDIT: To clarify, I meant the "Xreal Air 2 Pro", not the "Xreal One Pro". The latter are much more expensive.