Here are my top picks for places to find the best deals. As always, never ever make a purchase online without first checking if there is a coupon or cash back available. To do this, go to Google and enter the merchant's name and the word coupon (e.g. Best Buy coupon). Also make sure to read the reviews of the products you are considering. I like to always check Amazon for any products I buy as there are normally a good amount of reviews for nearly any product.
Bing Shopping While I haven't found any real reason to switch to Bing for general searches, Bing Shopping is a great way to get paid for shopping at a variety of popular online merchants. Bing is running a "gold rush" through December 2nd. The gold rush offers increased cash back amounts -- for example, Dell is offering 20%, eBay 10%, HP 20% and Footlocker is offering 25% cash back. Always read the details to make sure your purchases qualify for the cash back reward. If you find a deal on Bing Shopping, make sure to setup a cash back account first and then shop so that you receive the cash back amount.
Fatwallet and Slickdeals These two forums are my favorite for finding deals. Both Fatwallet and Slickdeals offer forums that are loaded with super deal hunters that post the best deals from across the web. You can also request help in finding a deal. While both sites have other content, I find the forums to be the best place to start. Fatwallet also offers cashback on about 200 stores so make sure you signup for a Fatwallet account. What's great is that the purchase still goes through the merchant's site just like a normal purchase.
Coupon Sites There are a variety of coupon sites that are providing lists for Cyber Monday sales. CyberMonday.net displays a variety of deals plus coupons for stores including Walmart and BestBuy. RetailMeNot has a listing of coupons for over 200 stores.
Always remember that just because a site says that the product is on sale, doesn't mean it really is. Check prices before making any purchase to make sure it is a deal. Also, if it's your first time shopping at a merchant, make sure that you check their ratings for shipping, returns and customer service.