Costco sells a 10 pack of Brita filters for $41.99. The math is really easy for this one. $4.199 per filter.
Target sells a 6 pack of Brita filters for $29.69, or $4.948 per filter. If you change your filter every two months, that’s six filters per year or an annual savings of $4.50 by buying in bulk from Costco.