Ending today at 3:40 pm ET (or when 100% claimed), Amazon offers the Samsung 64GB Pro Class 10 SDXC UHS-1 Memory Card, model no. MB-SG64D/AM, for $29.99 with free shipping. That's tied with last month's mention as the lowest total price we've seen. (It's also a current low by $26.) It features a read speed of up to 90MB/s and 50MB/s write speed. It's also water-, X-ray, magnetic-, and temperature-proof.