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.

Corsair XMS2 4GB (2 x 2GB) PC2-6400 800MHz 240-pin DDR2 Dual-Channel Memory Kit – TWIN2X4096-6400C5

Sunday, 07. March 2010. 21:29 by memory sdhc

Corsair XMS2 4 GB (2 X 2 GB) PC2-6400 800 MHz 240-PIN DDR2 Dual-Channel Memory Kit - TWIN2X4096-6400C5 List Price: $87.99
Want more discount? get it here -> compare price
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The TWIN2X4096-6400C5 G is a pair 4096MByte of DDR2 SDRAM DIMMs. This part delivers outstanding performance of the latest generation of dual-channel DDR2-based motherboards. It has been tested extensively in most DDR2 motherboards to ensure compatibility and performance at rated speed. This memory has been verified to operate at 800MHz at low latency of 5-5-5-18.
buy it now!

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