Cheapest way to upgrade Xbox One storage?

Hey everyone, so I have had a 500gb Xbox One for a year now and after receiving a few games for Christmas It's time for me to upgrade my storage does anyone know of a cheap way to do this? I would prefer something 2tb's or over if possible but if the price is really good for a 1tb I could settle for that for the time being. Thank you in advance for all replies and help anyone can provide.

Everyone is gonna give you different options: Get a 2tb WD passport or a 4-5tb WD MyBook. 

3-6tb drives are usually anywhere from $100 to $150 on sale. Those are 3.5" drives. Smaller 2.5" drives max out at 2tb. 500/750gb drives are usually less than $50 on sale. Which doesn't sound like a lot. But the xbox one has barely over 400gb after the format and the space for the OS.