I have looked at them. The guy I buy from actually is local, 18 miles away. I just call him up and put in a order. Very easy to work with. Last one I got 100 filters for $155. Picked up 12 for each of my mowers, 16 for my tractor, 12 for Ford F-150/Lincoln Aviator, 12 for my Titan, 6 for my neighbors Dmax, 6 for his Ford Tractor, and the rest were for boats. In that order I also got 8 air filters, 6 fuel filters, and 6 hydraulic filters plus a few other miscellaneous filters.
Just the Ford F-150 air filters were $15 each at Walmart. I had over $80 alone in air filters but got them for about $3 each from him.
Chris