As one of its daily deals, Amazon offers Prime members the Lexar 16GB Platinum II 200x Class 10 UHS-I SDHC Memory Card, model no. LSD16GBBNL200, for $6.39 with free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $8.02.) That's the lowest total price we could by $5 and the best deal we've seen. It features transfer speeds of up to 30MB/s. Deal ends today.