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Amazon [amazon.com] has 512GB SAMSUNG PRO Plus UHS-I U3 A2 V30 microSDXC Memory Card + USB Card Reader (MB-MD512KB/AM) on sale for $ 35.99. Shipping is free.
512GB SAMSUNG PRO Plus UHS-I U3 A2 V30 microSDXC Memory Card + USB Reader $36 + Free Shipping