Walmart offers the Plano 42" Gun Guard AW Tactical Case for $56.36 with free shipping. (Amazon offers it for the same price.) That's the lowest total price we could find by $24. It features dual-stage, lockable latches and pluck foam.
Walmart offers the Plano Field Box, model no. 1312-00, for $4.88. Opt for in-store pickup to avoid the $4.97 shipping charge. That's the lowest price we could find by $7. It can hold six to eight boxes of ammunition.