I am looking for a mini laptop to buy and I need a cheap laptop which is cheapest laptop. I also need laptop to have facility to change its cover so that i can change its cover color. you know this way my laptop will look new every time I change new cover. also it when there is scratch on cover I can replace with another one and sctrach is gone.

Please sugest me which laptop I can buy with my above needs.

I can suggest following but I am not sure other than DeLL has interchangeable back cover.
Asus Eee PC 1215T 12" Netbook 2GB DDR 320GB HDD - 1080P Video
Asus Eee PC 1201T
Asus Eee PC 1201N
DellTM InspironTM M101z (250gb HDD WALA)