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Cheapest ever. Kingston Digital 64 GB SDHC/SDXC Class 10 UHS-1 Flash Memory Card 30MB/s (SDX10V/64GB).
$ 28.99 USD + $5.08 USD Shipping (~ $38). I think they will increase the price soon.
Price watch $50+ with shipping
Up to 30MB/s read, ultra-high-speed bus I (UHS-I)
Secure - built-in write-protect switch prevents accidental data loss
Compatible - with SDHC & SDXC host devices; not compatible with standard SD-enabled devices/readers
File Format - FAT32
Great for HD Video video recordings
Reliable - lifetime warranty, free technical support