Mountain Lion and Mavericks work fine on Retina screens. You can actually run Mountain Lion in Parallels on your current Mac right now (I recommend VMWare instead because its performance is better for Mac guests.) I expect you'll be disappointed though, because there's no graphics acceleration. It's super sucky.
If you wanted Mountain Lion and still wanted to stick with Amazon, you could get (for example) this: https://www.amazon.com/Apple-MacBook-ME664LL-15-4-Inch-Display/dp/B078WGK955/ref=sr_1_2?dchild=1&keywords=ME664LL/A&qid=1615518498&sr=8-2
I don't know what OS comes preinstalled, but all you need to do to reinstall the original OS is hold down Shift-Option-Command-R while starting the computer. https://support.apple.com/guide/mac-help/reinstall-macos-mchlp1599/mac
It's all up to you of course, I'm just trying to help! I was in your position a year ago. You can either complain forever, or you can do what it takes to solve the problem.
Edit: As for the actual OS https://www.apple.com/shop/product/D6377Z/A/os-x-mountain-lion. But, if you buy a computer that shipped with Mountain Lion, there's no need to buy a copy. Just do the startup sequence.
If you wanted Mountain Lion and still wanted to stick with Amazon, you could get (for example) this: https://www.amazon.com/Apple-MacBook-ME664LL-15-4-Inch-Display/dp/B078WGK955/ref=sr_1_2?dchild=1&keywords=ME664LL/A&qid=1615518498&sr=8-2
I don't know what OS comes preinstalled, but all you need to do to reinstall the original OS is hold down Shift-Option-Command-R while starting the computer. https://support.apple.com/guide/mac-help/reinstall-macos-mchlp1599/mac
It's all up to you of course, I'm just trying to help! I was in your position a year ago. You can either complain forever, or you can do what it takes to solve the problem.
Edit: As for the actual OS https://www.apple.com/shop/product/D6377Z/A/os-x-mountain-lion. But, if you buy a computer that shipped with Mountain Lion, there's no need to buy a copy. Just do the startup sequence.
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