I've tested all the Ninja products on sale for Prime Day — here's the 9 you should actually buy

Ninja Air Fryer 4QT: was $129 now $79 @ Amazon
If you're after a basic yet versatile air fryer, this is a great deal. With a 4-quart, basket capacity, it's sufficient to cook fit 2 pounds of fries. This comes with convenient functions such as air fry, roast, bake and broil. Plus, at such a low price this is a deal not to be missed!

Ninja Air Fryer Pro 4-in-1: was $119 now $89 @ Amazon (save $30)
The Ninja Air Fryer Pro 4-in-1 is my top-rated air fryer for most people. It's a great compact air fryer that's got plenty of power, and I enjoy that despite its limited 5-quart capacity, it can cook up enough fries or wings for a whole family. And because of the 400°F top temperature, it's going to give you a delicious, crispy texture. 

Ninja PossiblePan: was $129 now $94 @ Amazon (save $25)
Available in 4 colors (although this color, cherry tart, is cheapest), the Ninja PossiblePan is one of the most versatile frying pans I've ever tried. It's got deep sides that can be used to bake and cook saucy foods, and it can also go in the oven. 

Ninja Mega Kitchen System, Black, BL770AMZ: was $199 now $119 @ Amazon (save 40%)
This is an older model from Ninja, but it's a good one and at 40% off it's well worth buying if you're looking for a blender / food processor combo. This kitchen system has a 64 oz. max liquid capacity, and its 1500 watt motor is incredibly powerful.

Ninja Foodi XL 6-in-1 Indoor Grill: was $259 now $169 @ Amazon (save $90)
Save $90 on the Ninja Foodi XL Indoor Grill with this Prime Day deal. This often-overlooked air fryer grill is one of Ninja's most versatile products. It can sear steaks and bacon, crisp up fries and chicken, and thanks to its in-built meat thermometer, it will never overcook your meats. 

Ninja IG651 Foodi Smart XL Pro 7-in-1 Indoor Grill: was $369 now $199 @ Amazon
Ninja's indoor grills are seriously slept on. This smart XL grill comes with a meat thermometer, a large lid to batch cook generous cuts of meat, and the ability to Grill, BBQ Griddle, Air Crisp, Roast, Bake, Broil and Dehydrate. 

Ninja DoubleStack XL Air Fryer: was $249 now $209 @ Amazon (save $40)
The Ninja DoubleStack XL Air Fryer is one of Ninja's most recent releases, and it's pretty clever, too. This two-drawer air fryer saves a huge amount of counter space by stacking one drawer on top of another, doubling its cooking capacity for its footprint. It's got two drawers of 5-quart capacity, and comes with roasting trays to stack foods inside the drawers, too. 

Ninja 14-Piece Knife Set: was $299 now $229 @ Amazon (save $70)
One of Ninja's best value options is this 14-piece knife set, and that's before this $70 discount. The set includes an in-built sharpener and even 6 steak knives. I've tried some market-leading knives in my years of testing, and this set from Ninja outperforms a lot of them. 

Ninja 12-Piece Cookware Set: was $399 now $269
Featuring 7 pans and 5 lids, this cookware set from Ninja has some of the best non-stick technology I've tried. You can use metal utensils while cooking and put these pans through the dishwasher without having to worry about flaking or damaging your pan. They're even oven-safe up to 500°F.