As one of its daily deals, Amazon offers the PNY Elite Performance 512GB Class 10 UHS-3 SDXC Card, model no. P-SDX512U3H-GE, for $319.99 with free shipping. That's the best price we could find for any 512GB SDXC card and a current price low by $80. It features 4K UHD recording capability and read speeds of up to 95MB/s. Deal ends today.