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OEMPCWorld.com: SanDisk 64GB Extreme Pro SDSDXPK-064G-GN4IN SDXC Memory Card C10
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Amazon.com: SanDisk 64GB SDXC SD Extreme Pro Memory Card Bundle Works with Sony Alpha a6400 Mirrorless Camera (ILCE-6400/B) 4K V30 U3 (SDSDXXY-064G-GN4IN) Plus (1) Everything But Stromboli (TM) Combo Card Reader :
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SanDisk 64GB Extreme PRO A2 microSDXC Card UHS-I U3 V30 Read Speed up to 200MB/s for 4K UHD Video (SDSQXCU-064G-GN6MA) - Newegg.com