I was eyeing a low mileage 1991 Olds Cutlass Ciera S on Craigslist, mostly out of nostalgia since it reminds me so much of the 1989 Celebrity my grampa used to have, so I was looking up parts for it, and noticed that the oil filters for it are going for as low as 55 cents on RockAuto. It looks like they've probably been out of production for years at this point, on AAP the filters that came up were "use until inventory depleted," Looks like RockAuto has the last 3 ACDelco UPF1072 in existence, I'm sure they're ancient and I wouldn't pay anywhere near $10 for them. But man take a look at all these sub $1 filter cartridges.