Amazon offers its Prime members the Samsung 64GB EVO UHS-I Class 10 microSDXC Card with Adapter, model no. MB-MP64DA/AM, for $19.57 with free shipping. (Non-members can qualify for free shipping with orders of $35 or more; otherwise, shipping adds $8.) That's $6 under last month's mention and the lowest total price we've seen; it's a current price low by $3. It features data transfer speeds of up to 48MB/s.