Can’t find 11th gen?!

I’ve had the 10th gen since 2019, and I love it but it’s gotten insanely slow. Like it’s painful to get started reading (which I am seeing is common for this model.) I see the 12th gen deals for cyber Monday, but I’m also seeing the best reviews for the 11th gen. Where can I purchase the 11th, as I’m not seeing it as an option on amazon at all?