Amazon offers Prime members the Circulon Sunrise 1.5-qt. Whistling Tea Kettle in Navy Blue, model no. 51392, for $15.49 with free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $7.87.) That's the lowest total price we could find by $5. It features an enamel exterior and whistle alert to boiling water.