B&H Photo-Video offers the Kingston 64GB Class 10 SDXC Secure Digital Extended-Capacity Card
, model no. SDX10V/64GB, for $43.25
with free shipping
. That's $0.68/GB and the lowest total price we could find by a buck, although most merchants charge $50 or more. It features a 10MB/sec minimum transfer rate. Deal ends February 28.