Not sure if this is at all Goodwill locations, but when I went today, there was a sign that all jeans/denim was 50% off today and tomorrow only. So I got a pair of Gap maternity jeans for $2.50!!!
At the Goodwill down the road from me, (stupidly!!) Maternity is mixed in with non-maternity, and the place is kind of big... it'd take me all day just to get out of the denim section!
Re: Goodwill: 50% off all denim (maternity included)