BuyDig offers the Sony 16GB Class 10 UHS-1 Secure Digital High-Capacity Card, model no. SF16UX/TQN, for $19.99. Better yet, add two to your cart and the price for both drops to $24.98. With free shipping, that's $0.78/GB and the lowest total price we could find for this quantity by $11. (For further comparison, we saw one for $15 shipped in August.) It includes downloadable recovery software that can repair damaged files or recover files accidentally deleted.
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