Hi,
Black friday sales are the sales at various retail stores the friday after thanksgiving - this year on Nov 23. Most outlets will offer deep discounts on their merchandise and open stores early (some as early as 5 a.m.). the items with the biggest discounts sell fast and sometimes the stock is limited so it sells out fast. you can save a lot of money if you know what you want and are quick to grab it. most newspapers advertise sale prices earlier too. but it is quite an experience - i've done it a couple of times but it is not something i would recommend unless you want to buy a lot of things. the polite, friendly americans you see suddenly turn into this yelling, screaming, running mass of people to get to the stuff. happy shopping!!
Mythraeyi