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Amazon.com has Purolator A49179 PurolatorONE Advanced Engine Air Filter on sale for $6.75.
Shipping is free with Prime or orders $35+.

–[list][*]Multi-fiber, high dirt trapping media[*]Traps up to 99% of dirt, soot and other damaging debris (based on ISO 5011 on A24278)[*]Replace every 12 months or 12,000 miles (refer to your owners manual for recommended maintenance schedules for your vehicle)[*]A new air filter can improve acceleration by up to 11% (U.S. DOE study)[*]Helps prevent engine wear