Thumb Score: +4
Amazon has the MTM ACR5-72 Ammo Crate Utility Box with 4.5" Deep, Medium, Dark Earth on sale for $ 10.17. Free shipping for prime members. This can be used to store anything, not just ammo. It has a rubber o-ring gasket to keep things inside dry. Obviously not submersible but weather resistant.
Link: https://www.amazon.com/gp/product…UTF8&
Edit: Now ships 1-2 months