I bought most of my stash from thrift shops and attic sales. And, when I first joined y'all, there was a challenge (I think it started as a New Year's resolution) not to buy anything for our stashes. I took "the pledge" and haven't bought even an inch of fabric since then, but I do have a very large stash!
During hard times in the past, quilters used old fabric from dresses, etc. to make quilts to keep warm.
My suggestion for that fabric you are tired of ... can you find someone to trade with? There are people who will love what you have. Folks give away stuff to thrift shops and are always quickly sold.