Amazon (AMZN) is having a special promotion, today July 17 only, whereby if you buy an Amazon gift card of at least $25 or more for someone (including yourself), you can receive $5 in credit for future purchases.
This is like receiving an immediate 20% return on your money, with no risk, since you will probably spend at least $30 on Amazon at some point
The only catch is that you have to be an Amazon Prime member. Also, when you check out, you need to enter the promotion cade:
GCPRIME16
before you click on the Order button.
More information about the gift cards can be found at: