BuyDig offers the Samsung 64GB Pro Class 10 SDXC UHS-1 Memory Card, model no. MB-SG64D/AM, for $41.95 with free shipping. That's $7 below our August mention and the lowest total price we've seen. (It's also a current low by $7.) 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.