I have been using Wix filters for a while. They have a factory not far from here, although I'm not sure they make every type of filter there. The local NAPA store runs a sale each year and I buy filters for everything; 4 Fords, the 14 and the lawnmower. Saves quite a few bucks compared to buying them individually.
On a cost basis alone, you'd have to go through quite a few oil changes to exceed the price of the stainless reusable filter which goes for about a hundred bucks IIRC.
'07 CPB Blue; ZGST windscreen with MRA X-screen adjustable spoiler, tube bar adaptor, PC III, ATRE,BMC air filter, modified stock seat with 2nd Look cover,Scorpion Flame Ti slip-ons, Galfer rotors front and rear, braided-stainless lines, C-F 10R front fender, C-F hugger, C-F inner fairing panels, painted foreman's fins with faux C-F inlay, polished rim lips wired for heated gear and accessories, Givi V35 side bags and E41 topcase with SW-Motech qd mounts