This may be old caching in the browser, but also possible that Amazon is bouncing you to a third party seller, which it does from time to time for no reason.
Check “Other Sellers”.
There listing i posted is where Amazon.com is the seller, and is at $120.
The other one is where Woot is the seller, and that one is $299.
Looks like the price was $120 for only a few hours. It’s back to $300 now.