Chain/Sprocket

[Rascal300]

Y'all got good recommendations for a new chain and sprocket combo? It is necessary to replace at the same time, right? Chain needs to go for sure - can't adjust it anymore and there's way to much play. Sprocket doesn't look bad, but I've heard folks say they should be replaced in pairs.
Where's a good place and what brand(s) is/are considered best.
Thanks!

[Honda#4]

you always replace the chain and sprocket together.