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Get this Lexar Platinum II Class 10 16GB SDHC Memory Card 3-Pack, plus a 3-Card Wallet for $21.99 plus free shipping at BuyDig. Combined this is a low price by around $5 to $6. These memory cards are well-rated and Lexar is a trusted memory company. They have fast transfer speeds up to 30MB/s. There is no sales tax (except NJ).