Amazon offers Prime members the Morakniv Bushcraft Carbon Steel Tactical Knife, model no. M-12490, for $30.27 with free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $5.58.) That's the lowest total price we could find by $27. It features a tungsten DLC anti-corrosive black coating.
Note that it's expected to ship in one to two months.