Select the green colored type and 20% off checkbox shows! Got two of the green bottles for $3.30.
Yes *20% discount for me which only showed up after selecting two bundles of two. This only appeared under One-time Purchase, not in Subscribe and Save. That means $4.21 twice = $8.42 -20% (*on only one bundle of two) is $7.42 plus tax for FOUR bottles so that is $2.01 for each of four bottles!Thank you @davidd75.