Amazon offers the SanDisk 64GB Ultra UHS-I Class 10 microSDXC Memory Card with Adapter, model no. SDSDQU-064G-AFFP-A, for $50.50 with free shipping ($0.79/GB). That's the lowest total price we could find by $9, although we saw it for $12 less during Black Friday week. It's UHS-I enabled and comes with a full-size SD card adapter.