Blue Proton via Amazon offers Prime members the SanDisk 64GB Ultra UHS-I Class 10 microSDXC Memory Card with Adapter, model no. SDSDQU-064G-AFFP-A, for $33.99 with free shipping. (Non-members can spend $35 or more to get free shipping; otherwise it adds $8.) That's the lowest total price we could find by a buck, although we saw it for $4 less last week. It's UHS-I enabled and comes with a full-size SD card adapter.