Here in the states, Friday is when the Christmas sales season officially begins. The marketing people way back when started calling it "Black Friday" as it is often the day that stores go "into the black" to profitability for the year. It is usually a day with lots of shopping, good deals, waiting in lines and chaos.
Anyway, thanks to TFormers, if you are in the market for Transformers, they have a fantastic guide that breaks down all the various deals available nationwide. In general, most of the deals are nothing special; working out to be around 10-20% off retail but hopefully you will find what you are looking for at a worthwhile price.
Click here for TFormers Shopping Guide and click here for more info on BFAds.net which is the source I use for Black Friday information.