BuyDig offers the Samsung 4GB microSDHC Class 4 Secure Digital High-Capacity Memory Card with Adapter, model no. MB-MS4GA/US, for $7.99. Coupon code “FIRST2K” drops it to $3.49. With free shipping, that’s $0.87/GB and the lowest total price we could find by $3. It’s purportedly water- and shock-proof.

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