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Buy.com has the 16GB Kingston Secure Digital High Capacity Card for just $31.97. This flash card transfers data at 4 MB / second, which is faster than the 1MB or 2MB speed of basic cards. You'll notice this both when using the card in a camera and when transferring data off of it. Shipping is free and there's no sales tax (except CA, MA, MD, NY, TN). Compare this price to $61 at Office Depot.