Icepack
Yes i literally thought of this while throwing an ice pack around.
Once upon a time there was a group of survivors who managed to use all their ammo and obviously were in big trouble. All except for one survivor died. However, in a effort to try to run away, the remaining survivor threw ice packs at the zombies , tripped them, slowed them and made them look like idiots. Seizing the chance, the survivor manage to escape and told the story to everyone.
Attributes:
+Trip
+Slow
In a pack of 5
All for a nIce price of $40! Cool, right?