Discount on tax preparation

I finished my tax return this weekend! As usual, I used the online version of TurboTax. And what I found this year saved me some bucks

Since my tax return is not so complicated, I use TurboTax Deluxe, which regularly costs $29.95 (federal return only; state additional). There are some discount sites for the exact same software. Some are 20% off or even 25% off! I don't know why discount is available, but as far as I tried out, it seems like the software is the same. The best deal I found was TurboTax presented by American Express and TurboTax presented by Fidelity. These offer 25% off. It will cost $22.45 instead of $29.95. You do not need to be their customer either. It's easy to use and I'd recommend this everyone!