Amazon offers its Prime members this Ethical Coffee Company Espresso Decarabica Capsule 10-Count 5-Pack (50 capsules total) for $8.17 with free shipping. (Non-members can spend $25 or more to qualify for free shipping; otherwise, shipping costs $5.73.) That's $0.16/capsule, $3 under our April mention of a different flavor, and the lowest total price we could find for this quantity. These espresso capsules are used in Nespresso Capsule Brewers.

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.