The Sony FE 400-800mm f/6.3-8 G OSS lens is no longer available for order at B&H Photo and Adorama, and the Amazon listing is now $700 more expensive (from $2,898 to 3,599):
I did check, and the seller on Amazon (AVC Photo Store & Studio) is an authorized Sony dealer, not a third-party reseller known to inflate prices.
Leica, Fuji, and Blackmagic have already announced price increases, and Canon will follow soon:
Here we go: Blackmagic Design increased prices in the US only
Breaking: Canon to increase prices in the US as a result of the new Trump tariffs