What is best to kill hedges down to the root ?

Question:And can you find it at Ace Hardware or some of the chain stores, like Walmart, Lowes, Home Depot, and so on. Something that the avg, person can buy. thanks!!!

Answers:
A product called Crossbow is good. I believe anyone can buy it but probably not at one of those stores. A good bet would be a Tractor Supply store or an Orscheln's or some store that is a little more agricultural than Walmart, etc.