Sale prices don't drive my fabric shopping. My time is the most expensive part of quilting for me. I'm extremely picky about my fabric choices. But I do have my pricing limits. Well...unless I really want it! I did purchase my originally designed fabric from Spoonflower for, I think, $17.99/yard. But, I don't do this very much.
(I don't participate in fabric swaps for these reasons.)
Now, thread is a different story. I'm totally lost in the world of thread. Coats & Clark is what I grew up with and am familiar with. I would like to buy on sale, but not sure of qualities. I want quality thread on my quality quilt!!