The gadget sales may have started on Friday but they're not over until you've maxed out your credit cards. There's a handful of sales starting tomorrow, and even some deals starting today.
Kobo is going to have an ebook sale tomorrow, and you can find their sales. The page won't be live until midnight, though.
Barnes & Noble is boasting that they too are having a sale. Buy a Nook online (with a Master Card) and you can get a $20 gift card. You can also still get the $10 gift card when you buy a $75 gift card.
Best Buy is offering a $25 store credit when you spend $250 or more online today or tomorrow and then pick up your order in a store.
Walmart just sent out an email promising deals, but I haven't seen anything to tempt me yet. You can find their deals here.
And of course Amazon has set up a Deals Store for Cyber Monday. As per their usual SOP, that page will feature quantity and time-limited Lightning Deals. There are also supposed to be deals on Kindle ebooks, with some titles available at up to 80% off.