Through 9/2 Drugstore.com takes 20% off Green & Natural Products to promote environmental friendliness. This deal coincides with a buy one get one 50% off deal for Greenies for your dog, so for two 12-packs the price is just $15.59. This is $5 less than we could find elsewhere. This PUR Ultimate Faucet Mount Filter drops to $20.64, an $18 savings on the next-best price we could find. Shipping adds $5.99 but is free on orders over $25. There's no sales tax (except in NJ, NY, and WA).