Walmart offers the Plano Ammo Can M2A1 Field Box in OD Green, model no. 171200, for $14.99. (Amazon charges the same with free shipping for Prime members.) Opt for in-store pickup to dodge the $5.99 shipping charge. That's the lowest price we could find by $9, although we saw it for $3 less last November. It's made of heavy-duty plastic and features an air-tight seal.