I purchased one from viz a little while back. It's an exceptional coin and I like the hidden storage feature. For anyone that wants long-term microSD storage using a coin like this, I recommend Swissbit:
https://www.digikey.com/product-detail/en/swissbit/SFSD0512N1BM1TO-I-ME-221-STD/1052-1202-ND/5762188These are basically military-grade microSD cards that should hold information for at least 10 years. Most USB / microSD flash drives will degrade and not retain their memory for anywhere near that length of time.