West Marine has storage crates on clearance for $7.77.
These are very sturdy milk crate-style with a variety of uses for storage at home, shop, or boat. I turned one upside down had no problem using it as a step stool as well.
Shipping is $10 or free on orders over $99.
I stocked up and bought 13 for free shipping, arrived today
https://www.westmarine.