with an average price of 40 euros for 64giga, it is right for the performance, anyway the price of SD card down so fast that it is an unnecessary arms race.
CAUTION before purchased
thought a check that your camera or camera manages the capacity of 64 gigabytes, this may seem stupid but if your device is output before this standard, there is little chance that it can read or used, why? because manufacturers are forced to stop the reading standard when the camera goes into production, asked for more performance not require a component change, that is why some old model are not even able to take the 32 giga see 16.
if that comment helped you thank you noted, and if I can help you ay see clearer, let me remark.