I searched and didn’t see this already posted. It’s probably YMMV, but when I opened Fire stick home page last night, the second carousel highlight was an offer for a $6 prime video credit for watching one movie or show on Pluto TV. I watched an episode of the new show, Elsbeth, so I’ll wait and see if my account gets the credit in a few days and post the update here.
https://pluto.tv/en/live-tv/5f15e…0007053
https://www.amazon.com/Pluto-TV-I…B00KDSGIPK