Amazon has the PNY Elite 512GB UHS-I microSDXC Card (P-SDU512U190EL-GE) (Up to 90MB/s) for a low $89.99 Free Shipping. This was $115 just a few months ago, so you save 22% off the previous best price and get the best price we've seen for this massive 512GB microSDXC card.
Up to 90MB/s transfer speed
UHS-I, Class 10, U1 rated performance
Resistant to temperature, water, magnetic exposure, shock