This eventually gets to the point, I promise.
Re: the Stranger Things Blu-rays, I worked in a (used & new) record store around the time Nirvana's Nevermind came out. For you youngsters out there, that's the album that more or less a third of the planet bought in physical form, not too many years before they gave up on physical media entirely. When it was hot, we couldn't keep it on the shelves. We'd pay top dollar for used copies and they'd get snatched up the second they hit the racks. Eventually it cooled off, and we were rolling in used copies, even though we only paid a nickel for them, and we started giving them away free with a purchase of $10 or more. But after four years or so, a funny thing happened. People started buying it again, and in no small numbers. Well, not really that funny--it was likely because Cobain died. But our seemingly endless stocks were depleted and didn't really return, so we started paying for used copies again.
I feel like Stranger Things is gonna be like that for Target (except nobody die please). They produced a ridiculous amount of media, and were so inundated at one point that they were practically trying to shove copies into the open windows of passing cars to get rid of them. They're still pretty cheap, but the thing is, they're simply very good--certainly better than most things out there--with broad appeal. Eventually all the copies will find a home.