If you have some free time and want to make a little extra money for not a lot of extra work, take a look at Opinion Outpost.
After you sign up (which is free), you'll get an email whenever there's a survey you qualify for. You earn points for taking them and get paid in points.
If you want an Amazon gift card, you turn in 50 points for a $5 gift card. IF you want cash, you'll need 100 points before a payout via PayPal. There are several more options too like United MileagePlus points, iTunes gift cards and a donation to the American Red Cross.
Who is behind Opinion Outpost? The company is Survey Sampling International and they've been around since 1977! They were started long before computers were in every home and they've been doing market research since then, utilizing cutting-edge technology to get the most accurate data for their clients. They now have over two dozen global offices in nearly 20 countries, though they're headquartered in Shelton, CT.
Give it a shot!
Another great place to earn Amazon gift cards is a company called Swagbucks. Swagbucks pays you points for doing many of the things you already do online – answer surveys, shopping, watching videos, … you name it, they have it. They pay out Amazon gift cards with thresholds as low as $3 and they will give you a $5 bonus to start.
Who is behind Swagbucks? Prodege is headquartered in California and they run massive cashback shopping site MyPoints. They've been around since early 2008 and have a stellar reputation in the rewards and cashback shopping market.