I buy a lot at garage sales, and that is how I support my LQS. A few weeks ago I found a wonderful sale of high quality fabric still in original LQS bags or otherwise marked. The seller is a loyal LQS buyer, and since I cleared out some of her fabric, she now has the space for more and will be running to the LQS to restock her supply.
To me the fun challenge in quilting is making something nice out of things that I find on the secondary market. My stash is plenty big, and I am usually patient enough to wait until I find just the right fabrics to go with what I have at garage sale prices.