One of the best ways to save money is by using cash back sites. Cash back sites help you save money by giving you a small percentage of the money you spend at online stores that the cash back sites have affiliate account with. So basically, you go to the cash back site of your choice, find the store or item you want to buy and click the link to go to the online store (you have to click THEIR link though, in order to get credit). Once you make your purchase and it clears you'll see the money in your account on the cash back site.
These sites are also referred to as "get paid to shop" sites, but that isn't really accurate. You aren't getting paid to shop but you are saving some money on purchases you'd make anyway.
Most of these sites have a cash out limit (usually between $5 - $20) and some of them have referral programs so you can even make some extra money by referring your friends and family.
One of the sites I like to use is Shop At Home. I've been paid by Shop At Home so I know they are legit (you can see my post about them here). But here are some other sites you might want to check out. I haven't used all of these sites or been paid by them, but I haven't found any complains about them so far. (Many of these links are referral links though, but if you'd rather not use my link you can go to the main page and sign up.)
I've written about this site before. Aside from being a cash back site they are also a "get paid to" site. You can get paid to do surveys, click on ads, refer others, etc. AND there is no minimum cash out. As soon as you want your money all you have to do is request it. You can see my original review here.
I've also written about cash crate. It is a "get paid to" site as well and it's one of the best ones out there. You can see my original post about cash crate here.
There is another site that is basically a cash back site, but for groceries. It's called Saving Star and basically the way it works is you sign up for an account and add your grocery store loyalty cards. Then you pick the coupons you want and add them to your cards (everything is done digitally so there are no coupons to print out of anything). When you have at least $5 in your account you can redeem it for a gift card or a paypal payment. I haven't used SavingStar yet because I live in a small town and we don't have any of the stores around here that use Saving Star, but I've heard a lot of great things about the site. They also have an app which is really hand to have in case you are in the store. You can see if they have any coupons that'll save you money.
It's a good idea (especially if you are making a major purchase) to visit different cash back sites and see how much money each site is offering. One site might be giving 4% cash back but another might be offering 5% or 6% back.
What sites do you use to help you save money? I'd love to hear about them. =)