Ebay offers Samsung - 64GB PRO Endurance MicroSDXC UHS-I Memory Card for $8.49 (reg. $16.99) free shipping.

Product Description:
Capture crucial moments with this Samsung 64GB PRO Endurance microSDXC memory card. The 100MB/sec. read speed and 30MB/sec. write speed handle large video files seamlessly, and the endurance rating of up to 26,280 hours supports extensive 4K and Full HD recording and playback. This Samsung 64GB PRO Endurance microSDXC memory card is shock-proof, waterproof and temperature resistant for use in extreme conditions.