Mobil 1 cartridge oil filters $2.24 or less, YMMV, Walmart in store clearance
I found the Mobil 1 M1C-456A filter at my local Walmart for $2.24 on clearance. They had several part numbers for the same price. All were the cartridge type, not spin on. I found a different local store that had them for $1, but they were out of mine. Highly YMMV.