I am so sorry your screen has cracked. Do you know if you signed up for Total Equipment Protection (TEP)? If you have, then you can call 1-800-584-3666 or go to http://phoneclaim.com/sprint to file a claim.
If you do not have TEP, then you may have to buy another phone at full price or if you have another device that you can use until you can get your Nexus replaced or repaired. There may be some third party repair store that may be able to replace your screen for you for alot less than full price or from Ebay or craiglists.
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