I just got this email from Old Navy:
In stores and Online for one day only (tomorrow, Saturday, August 23rd)
Old Navy Men's and Women's Denim are only $12.00
Children and Infants are only $7.00
There is a limit of 3 pair per customer.
They have also recently reduced prices on more items, so there should be some good clearances. Their online shipping is pretty cheap, so I always shop online instead of dragging my kids to the store with me!