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.

PNY OPTIMA 4GB (2x2GB) Dual Channel Kit DDR2 667 MHz PC2-5300 Desktop DIMM Memory Modules MD4096KD2-667

Friday, 19. March 2010. 14:16 by memory sdhc

PNY OPTIMA 4GB (2x2GB) Dual Channel Kit DDR2 667 MHz PC2-5300 Desktop DIMM Memory Modules MD4096KD2-667 List Price: $85.99
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4GB Kit (2x2GB) PC2-5300 667MHz DDR2 DIMM Desktop
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PNY OPTIMA 2GB (2x1GB) Dual Channel Kit DDR2 667 MHz PC2-5300 Desktop DIMM Memory Modules MD2048KD2-667

Wednesday, 17. March 2010. 13:21 by memory sdhc

PNY OPTIMA 2GB (2x1GB) Dual Channel Kit DDR2 667 MHz PC2-5300 Desktop DIMM Memory Modules MD2048KD2-667 List Price: $43.99
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DDR2 is the next generation of DDR memory. DDR2 memory features faster speeds, greater bandwidth, lower power consumption and thermal performance. Although DDR2 modules are the modules the physical size as DDR modules, the plug-in connector configuration is different and DDR2 are not compatible with PCs requiring DDR modules, and vice-versa.PNY manufactures DDR2 memory upgrades valued at PC2 – 3200, PC2-4200, PC2-5300 and higher. They are compatible with desktop and notebook computers and processors including Intel Pentium, Celeron, Centrino, AMD Athlon and Sempron Socket AM2, and others. PNY expansion modules are compatible with systems from Apple, Compaq, Dell, Gateway, HP, IBM and more than 5,000 other systems.Boost performance of your PC. The PNY memory upgrades will prove to be an outstanding value now and in the future.
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Corsair TWIN2X4096-6400C5C 4GB XMS2 PC2-6400 800MHz 240-pin Dual Channel DDR2 Desktop Memory

Tuesday, 09. March 2010. 23:54 by memory sdhc

Corsair TWIN2X4096-6400C5C 4GB XMS2 PC2-6400 800Mhz 240-pin Dual Channel DDR2 Desktop Memory List Price: $99.99
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The TWIN2X2048-6400C5 is a pair of 4 GB of DDR2 SDRAM DIMMs built using Corsair latest performance combined with high tech heat sink. This part delivers outstanding performance of the latest generation of dual-channel DDR2 motherboards like the nForce 780i chipset from NVIDIA. 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 5-5-5-end signature 18.Sporting sink Corsair patented heat-removing products IC XMS2 new feature dominant performance while promoting increased stability. It has been tested extensively in most DDR2 motherboards to ensure compatibility and performance at rated speed. Ask The RAM GuyCorsair has created a site 24 / 7 customer support online only for you to www.asktheramguy.com. Here you can find other people like you who are "in
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PNY OPTIMA 2GB (2x1GB) Dual Channel Kit DDR 400 MHz PC3200 Desktop DIMM Memory Modules MD2048KD1-400

Thursday, 25. February 2010. 17:46 by memory sdhc

PNY OPTIMA 2GB (2x1GB) Dual Channel Kit DDR 400 MHz PC3200 Desktop DIMM Memory Modules MD2048KD1-400 List Price: $59.99
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2GB Kit (2x1GB) PC3200 400MHz DDR DIMM Desktop, notebook computers and processors such as Intel ¿s Pentium, Celeron, AMD ¿s Athlon, Sempron and others. PNY expansion modules are compatible with systems from Apple, Compaq, Dell, Gateway, HP, IBM and over 5000 other systems. Increase the performance of your PC to its maximum capacity. The PNY memory upgrades will prove an exceptional value, both now and in the future.
buy it now!