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B&H Photo and Video offers Lexar 633X 64GB Micro SDXC UHS-I U1 Class 10 card with SD Adapter @ $ 17 with free shipping.
This is a perfect solution for 4K recording in phones.

LINK:
https://www.bhphotovideo.com/c/pr…osdxc.html

SPEC:[LIST][*]Speed (X-rating): 633X[*]Bus Interface Speed: UHS Class I[*]Read Speed 95 MB/s Maximum[*]Write Speed 10 MB/s Minimum