And how I wish that Roku's were $20. My Roku's are all Ultras, that's because we prefer to hard wire our internet, and those devices are $100, not $20.
Roku is able to grant your wish. In fact, Walmart was selling them for $15 on Black Friday. If you prefer a fancier one, that's fine too. After I bought my first laserdisc player, I liked it so much that I bought Pioneer's "Ultra" LD player for $2700. (Actually, that was their 2nd best model but it was close enough for me.)
So you can go fancy if you wish, but you could "get by" with a $500 LD player, and you can "get by" with a $20 streaming player. Whatever floats your boat.
Either way, these days you can get a lot of TV hardware for very little money.