Not sure what "constraints" you are talking about, unless cost of fabric. I have collected a nice sized stash so I never need to go out and shop in order to make a quilt. I do shop, but just to add to the stash, usually, and only when I find good deals.
I've discovered a great place to shop for nice fabric... Facebook! There are all kinds of "fabric destashing" pages where you can shop or list your fabric for sale. If you are sick of some of your fabrics, sell them and buy others that you like better. You can find some real good deals there.