I buy them from time to time if I really like the collection, and I get it on sale. I'm not much for charm packs as I think they are too limiting if I don't have a project in mind, but I will get a layer cake. I have bought a few jelly rolls, but I'm not a big fan of those. I like them when I want/need a quick project - a silent auction quilt or something like that where I don't have to spend any time accumulating fabric. My most favorite would be a fat quarter bundle, but that can be a significant investment.