One could get free gift cards off of Rewards1, Points 2 Shop, prizerebel or MyPoints. On such websites, one would complete a survey, task, or even by playing games!
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at a local store where they sell giftcards
You can buy minecraft gift codes, from the official minecraft website. The link can be found under "Sources and related links" below this answer. You need an account to buy gift codes. Though, creating an account is free.
It really depends on where you live. Some places have giftcards that are $10, $20, and $39 but it's different in other areas.
You can get a free dominus if someone gives you one. You can also get one by earning a gift that contains one.
One can download the Outlook free version online at various websites. One can download a free version of Outlook at websites such as Softpedia and Tom's Hardware.