Amazon offers its Prime members the HP 32GB SDHC Class 10 Secure Digital High-Capacity Card, model no. CG790A-AZ, for $20.99 with free shipping ($0.66/GB). (Non-members can spend $25 or more to qualify for free shipping; otherwise, shipping costs 99 cents.) That's $4 under last month's mention and the lowest total price we could find now by $11.

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.