So far I paid $1 to play FH4, Gears 4 and Crackdown. When there is more I can always get it for another month. You can simply make a new account and get it for a dollar again. I have no intention to subscribe for longer than it takes to play one of the exclusives
Currently thats the deal going around this year however its all a promotional deal to build the GamePass eco-system. Once built, i wouldn't be relying on those sort of deals come Scarlet. Those prices are also subject to change. They could up the price, we dont know.
Either way, if you prefer to rent your games than more power to you but come a time you want to play the games again, out comes your wallet and MS eyes will look like this $.$