I agree too, I have found a lot of those sales are fabrics that have been in someone else's house for 10+ years and are older, thinner styles that I really wouldn't use. People that spent $10/yard on newer styles don't sell off like that. (Well maybe they will in 10 years, but not yet anyway!!) Plus it sounds like you already have a decent stash, so no matter the price having more fabric than you know what to do with will only put you in the same position as this woman 10 years from now, except you'll be trying to sell 20 year old fabric then.
I vote, stay home and dig into your stash and quilt quilt quilt. If that doesn't sound appealing, reorganize the fabrics you do have. Pulling them all out and refolding them all will surely put a damper on the want to buy more!
Cheers!
Rachel