VMInnovations via eBay offers the refurbished Ninja 6-Quart 3-in-1 Slow Cooker in Black for $49.99 with free shipping. That's the lowest price we could find for a refurb by $11. It works as an oven, stovetop, and slow cooker and features a nonstick pot. A 150-recipe book is included. Note: A 5-year warranty applies, although it's unclear who backs it.