This Ninja DCT451 12-in-1 Rapid Cook & Convection Double Oven originally $389.92 dropped to $329 and then again to $249.99 at QVC. You save 36% off the retail price for this countertop convection oven. Plus, this item ships free. This is the best price we could find online by about $30. The Ninja DCT451 Convection Oven comes in your choice of two color styles and features two independent ovens, multi-function cook settings, and Smart Finish technology. Sales tax is charged in most states. Deal expires soon.