Old Navy is having a one day Saturday sale for selected jeans. It's just for today and it's available online and in stores. I think the stores might have more of a selection but most of the stuff is available online too.
Keep trying on the website. I just got 2 pairs in Long inseam, but I had to wait quite awhile for each page to come up, i.e. sign-in and checkout. Because I used my Gap card, I got free shipping and paid $25.48 for 2 pairs of jeans. Gotta love that! And yes, you can return them to the store, but make sure you keep the receipt you got with the package, otherwise it's a huge hassle.
Thank you for posting this. I went there, today, and it was a madhouse! You were only allowed 3 pr of jeans, total. But I guess that's only fair, so that more people get to buy some. I just wish I could've gotten 3 pr of childrens, and 3 pr of womens. The checkout line was literally wrapped around the store, all the way to the front door!