Amazon offers the Jif Whips 15-oz. Peanut Butter Spread or Jif Whips 15.9-oz. Peanut Butter & Chocolate Spread for $2.98. Add it to your cart via Subscribe & Save to drop the price to $2.83. (Walmart and Target have the Peanut Butter flavor for a few cents more via in-store pickup.) With free shipping, that's the lowest total price we could find by at least $12.
Be sure to cancel your subscription after your order arrives to avoid being billed for subsequent shipments.