Adorama offers the SanDisk 64GB Ultra SDXC Class 10 Secure Digital Extended Capacity Card, model no. SDSDU-064G-A11, for $46.95 with free shipping ($0.73/GB). That's a buck under yesterday's mention and the least expensive 64GB Class 10 SDXC card we've seen. (It's also a current price low for this model by $10.) It features read speeds of up to 30MB/s and write speeds of up to 10MB/s.