JD Clear Film 5-Pack
If you're not worried about the quality or type of screen protector you buy, but just want to make sure you have more than enough, consider JD.
This is the cheapest type of screen protector available. PET Film isn't as durable as IQShield or Skinomi, but they install easily and are extremely cheap. This will keep your Pixel 2 XL screen safe, but don't expect the film to last very long. Good thing you get five screen protectors for under $13.