It's still listed - https://www.amazon.com/Canon-Full-Frame-Mirrorless-Megapixel-Processor/dp/B08C68F2DX

However, Amazon will often make an item unsearchable if they don't know when they're getting more stock and they have no other resellers who are offering it. That seems to be the situation with the R5.

If they knew when they were getting a 2nd shipment, it would still be searchable.