if its internal Apple will replace it as defective. (Assuming its in warranty still). If its external or out of warranty, buy the part on ebay and following the replacements from ifixit.com
should cost you about 100$.
I was cleaning my iPad tonight and I noticed a small crack in my screen. I've had this iPad 2 for almost a year and this the only damage ever. I'm a little bummed. Will the crack spread; is it easy to repair?
I went to the apple store and they gave me a new one.