There are several options out there. these are a few that are available at different autoparts stores or autobody supply stores
These are all available at different places, these are just the first links i found
http://www.harborfreight.com/professional-windshield-removal-kit-96339.html
http://www.sears.com/ate-professional-windshield-removal-tool-with-resharpenable-steel/p-SPM7537256902P
http://www.ebay.com/itm/18-Professional-Heavy-Duty-Windshield-Window-Removal-Knife-/261135312649
http://www.sears.com/search=neiko%20pro%20tools%20usa%20air%20windshield%20remover%20with%20blades
i didn't feel like looking any more up.