Making a sport of finding the Aliexpress listing for clearly generic Amazon products - especially if they have good reviews.
1/5th to 1/10th the price, usually free shipping if you buy a dozen, which then roughly adds up to the Amazon price, but now you have a dozen. When they arrive in two months. Occasional point to Amazon, there.
Makes me think of an MMO-style auction house. By the bulk listing, resell what yoy don't need for 1 less to pass them onto the next person that need them.