I looked on Microsoft's site but all it says is
to contact their sales team. Did you have luck with that process? Usually when a company says 'contact sales' that means it is very expensive.
It seems like Microsoft are afraid to make it easily available because if word got out every enthusiast and power user would switch leaving them without the ongoing ad revenue.
You need to buy into Volume Licensing, which requires at least 4 licenses. You can't buy it directly from Microsoft, but there are resellers that will sell it to you ( https://appsource.microsoft.com/en-us/marketplace/partner-di... ). It works out to about $200.
Afterwards, you'll be able to buy an LTSC license. It's around $300 per device.
I'm pretty sure that individuals can't just buy any Enterprise edition, this one included. Everyone, or almost everyone who's running LTSC outside of enterprise settings is doing so through "other, mysterious ways" that I'm not sure I can mention on here. There may also be unrelated scripts that can strip a normal install of Win10 into something resembling LTSC, but I might be misremembering.
I looked on Microsoft's site but all it says is to contact their sales team. Did you have luck with that process? Usually when a company says 'contact sales' that means it is very expensive.