Today only, Amazon offers Prime members the HP 32GB SDHC Class 10 Secure Digital High-Capacity Card, model no. CG790A-EF, for $22.49 with free shipping ($0.70/GB). (Non-members can spend $25 or more to qualify for free shipping; otherwise, shipping costs $8.06.) That's $2 under our April mention and the lowest total price we could find by $12.

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.