Purchase replacement Nutri Ninja parts directly from Ninja on the company's official website, NinjaKitchen.com. Alternatively, buy replacement parts for the Nutri Ninja on PriceFalls.com or Amazon.com.
The Ninja website offers parts for every model its sells. The blender area of the Customer Support section of the website lists all models and available replacement parts. Choose your model, and then click the Parts & Accessories link in the drop-down box to view available parts.
Pricefalls offers replacement gaskets for both the Nutri Ninja cups and the blade contained inside the blender. Amazon also offers the gaskets along with replacement blades, cups and other accessories needed for the product.