Thumb Score: +1
Google Express has the Samsung Pro Endurance 64GB Micro SDXC Card – 100MB/s U1 (MB-MJ64GA/AM) for $ 15.99 with Free Shipping [google.com] (before applicable tax)
This is already cheaper than the lowest recorded price from Amazon, but can be even cheaper with the Google Express 20% discounts for new (MARSAVE19) or for current customers (check your email, I have one that expires 3/5/19 using the app) – $ 12.79 with Free Shipping (before applicable tax)