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Is there a website where I can get inexpensive plymouth yarn? - plymouth yarn

I use a pattern that calls for different types of crochet son of Plymouth (the difference in son would, but I love these patterns and textures). It is a shop in my area of Plymouth that sells son and I had difficulty in finding online. Plymouth site is not for sale. Does anyone know a website that has different types of Plymouth, the son of a low price? Needed 27 balls / skeins of yarn, I have noticed that a total of 1 or 2 kinds of almost $ 6 per ball. I had expected something less expensive. Thanks for the help!