I think in some countries like China, 1 US dollars is worth a few Chinese dollars or cents, so the factory may end up making money by selling it for a US Dollar, and paying for the cheapest shipping which takes months to arrive by ships, and trains instead of a truck or airplane which is usually faster.
I think some people and factories want to get rid of their old stuff by sending it to someone who bought it off them for a penny. There are probably factories which made too many products like keychains, paper clips, rubber bands, fidget spinners, and toys, and selling them for a $1 dollar and paying for shipping is cheaper than hiring a recycling company to recycle their products which they can't sell because the products are not good.
I think some people and factories want to get rid of their old stuff by sending it to someone who bought it off them for a penny. There are probably factories which made too many products like keychains, paper clips, rubber bands, fidget spinners, and toys, and selling them for a $1 dollar and paying for shipping is cheaper than hiring a recycling company to recycle their products which they can't sell because the products are not good.