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Kingston Technologies’ Store has the 64GB Kingston React SD 64GB (full SD size) for $ 41.99, with free shipping:
https://shop.kingston.c
Also available is the 128GB for $ 82.99 (basically twice the capacity for almost twice the price):
https://shop.kingston.c
These are UHS-II V90 cards, direct from Kingston (so you can be assured of their authenticity). They are particularly useful in cameras to capture sequential shots without buffering.