There are many websites right now that you can find to 'share' the ads that have already been leaked for Black Friday. My favorite is here. This the is the website I have referred to for the last few years, and one of the best features it offers is that they compile 'buying guides.' If you are interested in purchasing some of the popular toys, a laptop, home appliances, a new t.v., etc., they go through the pro's and con's and tell you which store will offer the best bang for your buck. It at least saves a little bit of time comparing/contrasting what the different stores offer.
Check it out: Black Friday Ads