I would ask if you purchased the optional insurance available on most cell phone contracts, but the way insurance companies seem to work nowadays, they'd probably look for any reason possible not to warrant a claim. Still work asking regardless though.

You might check some sites like these for a replacement screen.

http://www.cellulardr.com/cell-phone-lcd-screen.html

http://www.repairsuniverse.com/cell-phone-parts.html