Buy.com has the Lexar Media Platinum II 16GB Class 6 Secure Digital High Capacity (SDHC) for a good price.
Pricegrabber Price : $34.29 ~ $49.99 Shipped
1. Buy.com Price : $23.50 Shipped
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Not sure if this is that good a deal. I got two 16gb class 10 SDHC from newegg.com last week for $48.12 and that included NJ sales tax and shipping.