http://www.amazon.com/Fix-A-Windshield-Do-It-Yourself-Windshield-Repair-Kit/dp/B000EA5WLS
A friend bought this at walmart since they had a small spider crack on thier windshield a few weeks ago.
Its basically a super cheap version of any professional crack repair kit....Getting this done at a dealer or shop would usually cost $50-100....
Ya gotta be patient but it worked out pretty well i guess... He recommends it so im passing it on :)