Well I decided to take a chance and get just the digitizer. Don't do it.
Here is why.
1. Separating the digitizer and the lcd may be possible. There is a piece of double sided tape holding them together. However just sliding a blade between the two rubbed into the lcd glass. When I though I had separated the two I ended up just removing the dark layer of the lcd, and destroying it.
2. The new digitizer does not come with the double sided tape. It is probably possible to make your own, but very hard as far as I can see.
Now that I wasted my $12 because I wanted a sprint logo on my lcd I am getting a lcd+digitizer combo for $20 that has at&t written on it.
Great video for a tear down.
http://www.youtube.com/watch?v=SYqNlM68_as