Believe it or not, oil filters. Champion Labs and Wix make a lot of your OEM filters, and between the two of them, make all four major parts store chain store brands except for the Autozone commercial filter (which is made by Honeywell/Fram).

The STP filter at Autozone and the Carquest filters at Advance are made by Champion Labs (who also make ACDelco filters for GM), and the Napa and O’Reilly Microguard filters are Wix (who, along with Purolator, make Motorcraft filters for Ford). I’m not a big Fram fan, but if you are, they make Walmart filters and Autozone’s Autolite line for commercial use.