Amazon offers Prime members the SanDisk 64GB Ultra UHS-I Class 10 microSDXC Memory Card with Adapter, model no. SDSQUNC-064G-GN6MA, for $15.99 with free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $8.02.) That's the lowest total price we could find by $4, although we saw it for a buck less two weeks ago.