There is a deal running on the Disney Store that is a pretty good one- you can get a free lunch tote with purchase of a backpack. The backpacks start at $16.50 and they have several designs for girls and for boys.
You can also get free shipping with any back to school purchase with promo code: SCHOOLSHIP.
Just head on over to Disney Store and select both the backpack and the lunch tote that you want. Enter the free shipping code and you should have a great deal!