Amazon offers the Old Bay Seasoning 6-oz. Can for $3.55. Add it to your cart via Subscribe & Save to drop the price to $3.37 and bag free shipping. That's about a buck less than you'd expect to pay in local stores, excluding the below mention. It features a blend of 18 spices and herbs.
Be sure to cancel your subscription once your order arrives to avoid being billed for subsequent shipments.
A close price: Walmart has it for $3.55 via in-store pickup.