Games at a certain point in their life are cheaper on console. At least, physically. I remember being shocked at this years ago, because I expected PC to be cheapest. But, a few years back, I went through and looked up a bunch of AAA games that were about 6 months old, and a lot of them were cheaper to buy physical, on console, from Amazon or another retailer. Cheaper than they'd ever been available for on PC, according to IsThereAnyDeal.

I think it's partly because, on console, the sellers / devs have an incentive to reduce the price of physical copies, because they need to compete with used copies. They killed used copies on PC, so they don't need to compete with that market.