Walmart offers the Samsung 64GB EVO UHS-I Class 10 microSDXC Card with Adapter, model no. MB-MP64DA/AM, for $20.94. (Amazon charges the same with free shipping for Prime members.) Opt for in-store pickup to dodge the $4.97 shipping fee. That's tied with yesterday's mention and the lowest price we could find by $4. It features data transfer speeds of up to 48MB/s.