A great site for making extra cash at home is The Penny Hoarder. There are tons of tips there ranging from saving money to making money.
Swagbucks has been one of my favorite apps so far. Its really simple to use, and there are several different ways of earning cash, some as easy as just doing a search. If nothing else, you get great cash back deals at some online stores. You can see my review for it here.
Amazon Review Club is another way to save money. Once you register, you get emails about things you may like. Some are based on your past purchases at Amazon. It is also searchable for items you may be looking for. Items may be offered at deep (or even free!) discounts. Once you get the item, you then give a review of it. Just make sure to include that you received the item at a discounted price. You can also register as a seller, and sell your items at discount prices in exchange for reviews. I have found a couple of pretty cool things on there so far.