B&H Photo-Video offers the SanDisk Extreme HD Video 16GB SDHC Class 10 Secure Digital High-Capacity Card 2-Pack for $56.98. (Adorama offers the pair for the same price.) With free shipping, that's $1.78/GB and the lowest total price we could find for two of these cards elsewhere by $29. Each card features 30MB/sec sequential read and write speeds.