You can find "New Old Stock" physical discs or product keys on sites like eBay, though authenticity varies.
“No one can trust MS today, and no one should trust them in the future. With every update they release, the overall experience is getting worse.” gHacks · 10 years ago Upgrading Instead of Buying can you still buy windows 7
If you already own a Windows 7 machine, you might not need to buy a new OS. Experts at CNET confirmed that the free upgrade path to Windows 10 has often remained functional for licensed users long after the official deadline. From there, many devices can upgrade to Windows 11 for free if they meet the hardware specs. CAN I BUY A NEW COMPUTER WITH WINDOWS 7? - pcfixit You can find "New Old Stock" physical discs
Activating keys can sometimes be difficult as Microsoft’s activation servers for older OS versions occasionally change. User Perspective on Modern Windows Experts at CNET confirmed that the free upgrade
Microsoft ended extended support on January 14, 2020. No new security updates are released.