UPDATE: Sold for $400. Congrats to the buyer! You got a great deal!
It has been only a year since I picked up my Insta360 X4, but now that I have a new X5, I am getting rid of all my X4 gear. This includes the X4, three batteries total, quick charger, dive case, lens covers, lens guards, several carrying cases, mix wind muffs, and more — some of these items never got used. I really expected the X4 to be around for two years before the replacement model came out ;-)
The X4 by itself is $424 on Amazon, but you can buy my whole kit for less than that right now if you want, or bid and try to get it cheaper: