Amazon offers Prime members the SanDisk Ultra 64GB UHS-I Class 10 microSDXC Memory Card, model no. SDSQUNC-064G-GN6MA, for $14.99 with free shipping. (Adorama charges the same. Non-Prime members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $8.02.) That's tied with our Prime Day mention as the best price we've seen and a current low by $3. It features read speeds of up to 80MB/s.