Hmmm… I did the same. 1) I wonder if we reached out to Amazon, if they’d credit us the difference. 2) If not (and if it’s worth the $4, which it’s maybe not), you could order one of these, and just return it (free with Prime) using your original order/receipt…? (Again, not sure if it’s worth it… just trying to think outside the box.)
PS for anyone else considering the cooler, it DEFINITELY seems like it’s worth $14. Very legit cooler.