Or international arbitrage. Lots of stuff sold cheaper in USA than other places. Even stuff like a big bottle of ibuprofen or allergy pills are much more expensive in Canada.
While arbitraging deodorant sounds silly, I have bought EU roll-on deodorants online before because they're not much of a thing in North America. And they don't melt into a mess in a hot car.
The trick is to get it on clearance. Some local stores will sell for a massive discount off amazon.
I do more ebay as I won't touch selling used on amazon but in the past I have bought pallets of new stuff at local auctions and sold them on amazon for significant profit. Ended up with several cases of Ember mugs once. Forget the price per mug but think I paid ~$600 and sold em for ~$2400 on amazon.
Sometimes consumers sell something they decided not to use. Either directly to another consumer, or to an aggregator who can turn a profit on the consumer's loss by obtaining lots of previously retail bought goods.
It's sunk cost fallacy to just think "I must use this thing if I can only sell it at a loss."
