I have looked into buying LTSC. Apparently you need a business (I own a “shelf” company which has never done anything, but legally it counts), and a Microsoft volume license agreement. I looked into the later. Supposedly there is this trick where you order all these useless-but-cheap Identity Manager CALs to cheaply meet the minimum order requirement for a volume license. But I got a bit stuck working out what to order (or even if it was still available through resellers in my country). I lost interest at that point.