I have a Kobo stick - similar to Chromecast and Fire, but without any of the extra costs. I bought it for about £35 a couple of years ago (might be cheaper now?) It is brilliant for catchup services. There are other free channels as well, but I haven't felt the need. Could add Now or Amazon, but there is plenty to watch without.
just got my firestick and one free month on Netflix about to watch The Crown - v excited. My 'smart' TV needed a dongle to connect to wifi/internet so I got a firestick for the same price. All my photos now stored on cloud and will do same for music - I'll be interested to see what the quality of TV speakers is like.