The UK amazon site runs a black Friday event all week. Its already up new deals every 15 minutes from 9am to 9pm and you can see whats coming up for the next 24 hours, just not the prices.
Got plenty of stuff from there over the years. Most things come back around, I guess as people order then pull out, so if you miss something its worse checking back again each day. You can see the prices for things that have already sold out.