Replaced the in-cabin air filter today (Part # 80291-SAA-J01) at 87,585 km. Purchased last year from College Hills Honda. I already have a spare purchased from HondaPartsCheap.com for next year and it only cost $21.56
Interior Cabin Air Filter Part # 80291-SAA-J01
$39.99 @ Richmond Honda (plus tax)
$23.39 @ www.collegehillshonda.com