Electronics coupons and discounts

I’ve been looking for discounts and coupons on electronics, because there are so many interesting electronic gadgets and appliances available today. I particularly like to buy  HDTV, laptop, home theater and psp or nintendo for my kids. Since they are quite expensive i cannot afford to buy them at regular price. Anyway, do you know of any online stores that give discounts on electronic products? I hope you could share them with us.