The effect is called the Lenz Effect. The moving magnet causes small magnetic fields, called eddy currents, to form in the metal (brass, aluminum foil/tube ...). These eddy currents have their own magnetic field (all electrical currents do). This is what is interacting with the moving magnet.
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Now obviously you know that you can buy Amazon gift certificates at Amazon itself, so the question about where to buy Amazon gift cards that occurs to most people is really about where to buy them offline.any supermarkets now have Coinstar machines so you should be able to get that gift card taken care of before you have to arrive at the party. If you need more tips, check my complete list of stores for where you can buy Amazon gift cards and hopefully there is one on the list that can help you out.