For its Prime members, Amazon offers six Febreeze Air Effects 9.7-oz. Spray Cans in Linen and Sky Scent for $20.94. Clip the $5 off coupon on the product page to make it $15.94. With free shipping, that's $2.66 per can and the lowest total price we could find for this quantity by $5. (Non-members can spend over $25 for free shipping; otherwise, shipping adds $11.21.) Note that this item is on backorder; no estimated ship time is known.

Amazon Prime membership is $79 per year; however, Prime is free for college students for six months, and free for parents and caregivers for three months.