I tend to save up & buy a Toast one. Because they last for years, esp the Fairisle type ones. I have one from 5 years ago that is still going strong and I wear almost every day in winter.
Whereas when I have bought cheaper alternatives they haven’t really been the same.
But the Toast ones are really expensive. Perhaps some of the Scottish knitwear companies? Or if you wait a little while until the winter things are in you can get lucky with unexpected places like River Island or some other high st brand.
John Lewis also sometimes have good knitwear in the sale. So do Cos. Toast knitwear really is lovely though.
Plümo also worth a shot. But also expensive.