what is the best time to buy computers? which model do you use for work?

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I use good computer with good configuration because i have lot of work at my home so i need to spend more hours so i like to buy this computer and i would like to buy another with in short period so before that i need guidance from you people so which time is the best time buy computers once in a year we may get cheap rates so i don't know the particular date so do you know anything about it?