It took me what felt like 100 space bar presses to get to the purchase link
I took me zero spacebar presses. There's a big blue purchase link at the top of the page, and it's anchored there and stays with you as your scroll through the presentation.
In my defense, I may have mistaken it for a login button of some kind. Usually the login link goes at the top right. It's uncommon for the "buy" button to be in the top navbar. It's usually at the same level as the product being presented.
I took me zero spacebar presses. There's a big blue purchase link at the top of the page, and it's anchored there and stays with you as your scroll through the presentation.