I have read a ton of research on google and found that the best option is from amazon.com
I also got very fast&free shipping from amazon for more than 50 usd items.

Transcend 4 GB Class 6 SDHC Flash Memory Card TS4GSDHC6E [Amazon Frustration-Free Packaging]

Sunday, 23. May 2010. 14:26 by memory sdhc

Transcend 4 GB Class 6 SDHC Flash Memory Card TS4GSDHC6E [Amazon Frustration-Free Packaging]

Product Description

Transcend 4 GB Class 6 SDHC Flash Memory Card TS4GSDHC6E [Amazon Frustration-Free Packaging]
List Price: $11.49
Want more discount? get it here -> compare price
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Fully compatible with SDA 2.0. Suitable for SDHC compliant devices, MLC flash chip with high transfer rates. Perfect for high-end digital devices. Make sure your device can support SDHC format before you buy! SDHC cards can use SD and SDHC.
Transcend 4 GB Class 6 SDHC Flash Memory Card TS4GSDHC6E [Amazon Frustration-Free Packaging]

 
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