The key is not to donate anything to those stores. The one in my area(Goodwill) has a literal mountain of clothing in the back--when you take a box of clean, folded clothing, they just dump it on the pile. Also, they pull out the good stuff and hold if for their antique sale, at which the prices are impressively high. I realize those are marketing techniques, but it is insulting to both contributors and buyers. I personally have found great good deals at garage sales in the summer.