CalicoPup: I've always kinda wondered who sets game prices and why games for consoles with physical media fall over time while games that are entirely digital with release dates 7-8 years ago are still at the $20 price point when the price that they're on sale for more reflect the actual price that the game should be listed at.
Publishers have the final say in the pricing of digital copies. Physical ones can be treated like any other physical product though, so each step on the distribution chain buys the copy at one price from the step before them and sells it to the one after them, usually at a higher one. But some may decide to sell at a loss in order to still get something on products they risk needing to throw away otherwise, such as those likely to get damaged, or to get so old that the disks may lose data, or get to the point that the version on disk may not even install anymore, or be unable to update, on a current OS for PC games, or be for a generation that's dying out in case of console ones. Even in case of packages that are little more than keys to download the game, or some additional content which should be included, off an on-line service this may happen, if those keys may stop working or the service may shut down or for some other reason become unavailable in a near future. And this is how sometimes you may find physical copies for a fraction of the price of a stream of bits...