Amazon Prime is meant to invoke the sunk cost fallacy in your mind. Why shop around when you’ve already sunk over 100 USD per year into “free” shipping? This mental bias towards shopping with Amazon is the cost and is part of an overall anti-competitive strategy. See “The making of Amazon Prime, the internet’s most successful and devastating membership program”. Jeff Bezos has been explicitly anti-competitive on this point:
“I want to draw a moat around our best customers.”
You don’t leave a moated walled garden unless the Lord who maintains the moat permits you. And even then, they’ll strip you of your DRM’d digital goods (TV shows, movies, audiobooks, ebooks) as soon as you cross the drawbridge. The strongest supporters of Amazon are the ones who have thousands of USD of such digital goods locked up with them since they can’t leave without being stripped of things they bought.
If you have room for the state of New Jersey, you have room for a Nalgene.