Blue Avocado is running a 4th of July promotion for 50% Off their kits. The sale is through midnight CST on 7/5/12. You don’t need a discount code as they’ve already discounted them online.
Blue Avocado specializes in reusable bags. One of their kits is a set of 6 reusable zip bags that you could use for taking sandwiches for your lunches to work, school, etc. They are marked down to $10 plus shipping right now.
They also have kits that have a combination of their collection of zip bags, collapsible bags, insulated bags, etc.