For Prime members only, Amazon offers the Lodge 8" Pre-Seasoned Cast-Iron Skillet, model no. L5SK3, for $10.59 with free shipping. That's the lowest total price we could find by $6. It's oven-safe and can also be used on grills and over campfires.
Amazon offers Prime members the Lodge 12" Pro-Logic Pre-Seasoned Cast Iron Square Grill Pan, model no. P12SGR3, for $27.19 with free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $10.64.) That's the lowest total price we could find by $4. It features a baked-on electrostatic spray of vegetable oil.