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1. A Bigger SSD Mini PCIe Card for an Asus Eee PC 900 for cheap
2. Battery for an Asus Eee PC 900

Any Help is appreciated.

Check www.newegg.com
or www.tigerdirect.com

As for batteries, check the manufacturer website, or those previously listed sites.

newegg is probably your best bet, they sel every part I can think off for really cheap.