At the time of writing this, there are 1.200 deals in total available a Woot. Some offers are discounted with up to 90%+ off.
Walmart is famous for offering a huge selection of products at really low prices. You will find mostly anything here.
There's a big selection of products in the tools category, including 3.100 hand toolsets, over 100 home tools kits, over 300 screwdriver sets, and over 90 socket adapter & extension sets.
Groupon is a great site to find discounts and coupons when shopping online. You can shop for products such as watches, electronics, and sports & outdoors.
There are over 6.000.000 tools to choose from at eBay, including over 1.500.000 power tools, over 2.000.000 hand tools, over 96.000 air tools, etc.