I've used these guys before for a hard drive replacement, terrific service and they did a great job. However, the price for this repair might be a little steep for you...
My friend, who bought her Nano at Best Buy, had her screen crack as well. I was playing Gamecube with another friend and she came up to us and said that they just gave her a new one. You can go to the Apple Store and see what they have to say. Good luck.
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iPodResQ LCD Replacement Service
Unfortunately, I don't know where you could buy an lcd or how easy it is to make the repair, good luck.