Amazon offers its Amazon Prime members the Kingston 16GB Ultimate X SDHC Class 10 Secure Digital High-Capacity Card, model no. SD10G2/16GB, for $17.99 with free shipping ($1.12/GB; newegg sells it for the same price. Non-members can spend $25 or more to qualify for free shipping; otherwise, shipping costs $8.02.) That's $1 under our mention from two weeks ago and tied as the lowest total price we've seen for a Kingston Class 10 card of this capacity. (Outside of the price below, it's a current low by $2.)

A close price: Adorama offers it for $18.95 with free shipping ($1.18/GB).

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. (Note that currently there's a waitlist for Amazon Mom.)