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Amazon [amazon.com] has 512GB Samsung P9 Express microSD Express Card (MB MK512T/AM) for $149.99 – $50 at checkout = $99.99.
Shipping is free.

also available from:
B&H Photo Video [bhphotovideo.com]

Savings
Save $50 at checkout

amazon.com/dp/B0FT995SPF [amazon.com]