Patriot EP Series 64GB Secure Digital Extended Capacity (SDXC) Flash Card for $33.99 shipped after this $10 rebate.  Here is a screenshot for your reference.  It features up to 50MB/sec read and up to 35MB/sec write speeds, and is complies with SDA 3.0 specifications and UHS-I compliant.  Most places have it for about $52.