Cooking.com offers the Staub 4-Quart Cast Iron Dutch Oven in Cherry for $99.95 with free shipping. (CHEFS, Cutlery and More, Wayfair, and several other merchants offer it for the same price, however they don't include the freebie mentioned below.) That's the lowest total price we could find by $50. It features a chip-resistant enameled finish, and it's oven-safe to 500 degrees Fahrenheit.
Update: Note that at Cooking.com you will also receive a 6-Piece Bamboo Tool Set for free. (It will automatically be added to your cart.)