6-Pack Brita Filters | $18 | Amazon | Clip the 15% coupon

Update: Sold out

After stocking up for just about $3 each, you might actually replace your Brita filters on the recommended schedule.

Nah, I’m just kidding, you’ll still use them way too long. But hey, at least you saved money in the long run. Just be sure to clip the 15% coupon to get this deal.