Samsung EVO 64GB Micro SDXC Flash Card w/ Adapter

This matches the lowest price I've seen elsewhere at Walmart, Amazon, etc. However, TigerDirect is the best choice for California residents with free shipping unless you have Amazon Prime membership.

Its also a rugged card that can withstand most of everything you can throw at it except maybe bending or folding it. "When it comes to surviving the elements, the Samsung card can survive up to 24 hours in seawater, and endure temperatures from -25° to 85° Celsius. Travel a lot and don't want to risk damaging your valuable data going through x-rays? This flash card is x-ray proof protecting your precious data from damage caused by airport X-ray machines."