I found a website filter1.com where you can sign up and order at reasonable pricing. They also supply a tool where you build and save a vehicle equipment filter list. You use the Wix catalog tool to look up the part numbers and save them under your account. Pretty cool setup for easy repeat ordering. Example is Bobcat 743 hydro filter 51482 $24.13 and Inner Air 422769 $12.34 and Outer Air 42222 $12.82. I think it is a pretty good deal with no sales tax on orders of 6 or more filters totaling $50.00 = free UPS ground shipping. You can email them at [email protected] I have no association with the company but thought I would send this out. With my car and equipment needs I think I can save a little $$.