Are stock replacement filters available?
Absolutely! Amsoil makes an Absolute Efficiency - Air (EaA) filter to fit most cars on the road today. Just use the online application guide at the Amsoil website to find the filter that fits your car. While you're there, pick up some oil and an oil filter and discover what premium synthetic oil can do for you and your car (think 12-month change intervals).
Guaranteed.
Amsoil EaA and EaAU Air filters are guaranteed free of defects for 100,000 miles or four years. Once per year you just clean it by gently vacuuming it, or blowing it off with low-pressure air. If you replace your regular paper-element air filter once per year, the EaA filter will pay for itself in two or three years. If you've been using an oiled gauze cone filter (like K&N) or an oiled foam filter, you save with an EaA filter because you don't have to buy a cleaning kit. There's no cleaner needed, and no oil to apply.