Amazon offers Prime members the Mobil 1 M1-103 Extended Performance Oil Filter for $9.89 with free shipping. (Non-members can buy it via Subscribe & Save to receive free shipping.) That's at least $2 less than you'd pay at a local retail store, although we saw a 2-pack for $18 in July. It features a 28-gram total capacity.

Update: The price has increased to $13.79.