Be careful when purchasing a Logitech xbox controller online. Reason being is that Logitech's first attempt at an xbox wireless stick went horribly wrong. It was pretty much like the one everyone swears by now but was longer from left to right. My first wireless controller was one of Logitech's first and I hated it.
So, in short, pay special attention to the picture of the product before you buy and if the controller looks funny skip it and look for the smaller one Logitech made.
Before

After

At first glance, they look the same.
You really dont have many other options. Lots of places are phasing out on second hand XBOX gear.
The first run Logitechs also have a bit more gloss finish to them. I still never hard a problem with them and the parts that come out farther are also more slender and even more comfortable.