I paid a lot for my Nikon Super CoolScan 9000, and don't regret it. However, the old CanoScan 4000 is very close for less money. Of course, you need to find one of either that is still working. You also need the proper interface connections...
If you want to use the original proprietary software with either, you can buy older computers with earlier versions of Windows or MacOS. Otherwise, VueScan. An original old computer will likely be cheaper than converters and work better.
A much easier approach is to run an older OS emulated with VirtualBox (free/open source). This lets you run an older OS inside Windows 10. I managed to get a very old scanner to work in VirtualBox/Windows XP, whereas VueScan couldn't find it on WIndows 10
Nikon Coolscans are they really that good vs the current new offerings
in The Digital Darkroom: Process, Technique & Printing
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A much easier approach is to run an older OS emulated with VirtualBox (free/open source). This lets you run an older OS inside Windows 10. I managed to get a very old scanner to work in VirtualBox/Windows XP, whereas VueScan couldn't find it on WIndows 10