Hello Brennen,
Thanks for using the Komando Community to ask you question. As we have all learned at some point in our life noting is ever free. I like Express VPN you can use it on up to 5 devices at the same time, including the Firestick. If you click here they have a promotion for 15 months for $100.05 which breaks down to $6.67 a Month.
I’m sure you can use Google for something cheaper, however I’m sure it will be from someone without much of a reputation.