Ebay offers Samsung - EVO Plus 512GB microSDXC UHS-I Memory Card for $69.99 (reg. $149.99) free shipping.

Product Description:

Up to 100MB/sec read; up to 90MB/sec write speed UHS-I U3, Class 10 512GB capacity Recommended for most digital cameras and camcorders with a microSDXC UHS-I slot
Expand your smartphone's storage with this Samsung EVO Plus microSD card. The 512GB capacity offers ample space to accommodate UHD videos and movies, while the 100 MB/sec. read speed ensures rapid data access. This Samsung EVO Plus microSD card boasts a waterproof design for durability, and the included full-size adapter allows use with a wide range of devices.