Win-7 Pro 64 is still available.
Beware the top offer at that link. Several of the reviews said the serial numbers coming with the disk were illegal and blacklisted by MS so they couldn’t install.
I wish I had stayed on my old Win 7 and not updated.
I have purchased Windows 7 Pro licenses, Windows 10 Pro licenses and Microsoft Office licenses through eBay for just a few dollars to use in virtual machines. People always say that these are scams, and I am sure that many of them are, but I have not had a problem from longtime sellers with good feedback. Even when I have had difficulty after a few months on one of my installs I received excellent customer support. I was sure I had been scammed, but I had just screwed up and rolled back my virtual machine to before I had registered the license with Microsoft.
You do not need to pay a small fortune for Windows 7 or Windows 10 Pro like in the Amazon Ad you linked to. The ones I purchased have all been from European sellers. I have no idea what their game is... licenses from recycled computers??? schools??? corporations??? Who knows... all I know is the licenses I purchased are still working and taking updates from Microsoft and show they are legit. Unless you are purchasing your license directly from Microsoft, it doesn't matter if you pay $5 or $500... your likelihood of being scammed are probably about the same. Others may disagree and I am sure that many have been scammed over the years.