The best deal is to go to Amazon and buy filters in bulk (four to ten at a time) and also order oil from them. For my use, I do an oil change once a year at about 3500 miles.
I go to a local store and get a Purolator L25277 (a reboxed MANN filter) for $14 and one of the 5W40s with "MB229.3" on the side. There is no way in hell I am going to order enough fliters for five or more years just to save $2 per filter.