Walmart offers the Hyper Tough 20" Stainless Steel Tool Box for $14.97. Opt for in-store pickup to avoid the $5.99 shipping fee. That's $15 off and tied with our mention from ten days ago as the lowest price we could find. It includes a tray and features side latches.
You don't even need an AARP membership card to qualify for the "senior" discounts at these stores.