[Fill1200]

Enterprise edition is almost the same as Pro. I use it as a labo PC for free. After expire, I reinstall.

[Incambino]

Enterprise LTSB is not however, it doesn't have the Store, Windows Apps or Cortana and doesn't receive feature updates only security ones.

I use a license key from work for my home PCs and it's lovely.

[EvanAnderson]

That's not a tenable option for "regular people".