BuyDig offers the Ninja XL 72-Oz Blender, model no. NJ600, for $79 with free shipping. (Amazon charges the same, although it's currently out of stock.) That's the lowest total price we could find by $21, although we saw it for $10 less last month. This 1,000-watt blender features a 72-oz. capacity and six blades.
A close price: Kohl's offers it for buck more via coupon code "CYBER20".