There are sites that you could earn gift cards for like amazon and buy cash in the gift cards but it take a long time it would probably take at least 6 months if you tried every day.
At Swagbucks.com you could earn gift cards and sometimes they have giveaways they gave away an IPod 5th Generation before so it's worth a try if your up to it but it would take a long time to earn all the money.
There are also other websites you could try but i trust this one and a lot of other people do too.
if you are looking for a one free IPad Mini right now your chances of finding one are just about 1 to none
So Good luck if your going to try Swagbucks.com or another website.