All4Cellular.com is selling the Otterbox 1000(manf page) Waterproof case for 7$ shipped.
If you want to 5.6% cashback on your purchase sign up for a Big Crumbs account and search for All4cellular.
Or you can make your purchase directly.
Deal goes til 6pm Hawaii time 8/26
Exterior Dimensions: 4.837" x 3.682" x 1.652"
Internal Dimensions: 3.700" x 2.350" x 1.000"
As of 11am(Hawaiian) looks like they are out of stock.