I love that I can click "Get it tomorrow" filters, and see the search results visibly change... and not a single one is actually going to be here tomorrow.

The same is true with two-day Prime. Even if you get to the item, all of a sudden, it's gone.

I think their argument is that it's "Prime" shipping (not two-day), so if their eco-get-it-in-a-week-option is available, that's still a variant of Prime.