FYI - GAP, Old Navy, and Banana Republic are having 30% off sale online till 10/2!

I'm using this as an excuse to buy some maternity things today.
Anyone have the Old Navy Rockstar Maternity jeans and/or the GAP Always Skinny Maternity Jeans? I'm wondering about the difference and whether I should spend more for the GAP or just get the Old Navy? I know the regular GAP Always Skinny fit me pretty well.

Any recommendations on what else to stock up on during this sale?