Didn’t see anything I wanted, but it makes sense.
I live in a college town and most student leases end on august 1st. Many of these people recently graduated and are flying to a new state, some are transferring colleges. Either way they need to get rid of stuff fast and have a deadline. This means a lot of people are selling a lot of stuff in the same window of time, which will bring down the asking price. Leave low-ball numbers with the sellers and tell them to call you if they change their mind. Sure enough desperate sellers will call you the day of their move.
Also its a good idea to check pawn shops about a week after the standard campus housing move out date
People also tend to just through away things out of laziness. You don’t even need to dumpster dive. Many times things such as mini-fridges are left right next to the dumpster. You can even just store them for a month and sell them to incoming freshmen