The cheaper and more expensive Castrol filters at K-Mart are both made by Wix/Dana. The cheaper one is, I believe, identical to the yellow Penske's except for the paint & box. The more expensive one is probably much closer in specs to a full fledged Wix, & costs the same in my area as a Wix($5). If I found either one at $1.25 to fit my car, I'd buy a bunch of 'em. Terry claims oil filters have much less effect on engine wear than air filters, & he oughtta know.
I found Penskes for $1.77 a couple of months ago, only bought two, have since regretted it. Each K-Mart store in NE Texas these days seems to be a law unto itself-can't count on any two doing the same thing.