Copied from Jalopnik...
"Pricing and ordering information oddly isn't available on their
website, but through the power of Google, I found a
few internet forums where the price is revealed to be $260 shipped per pair, or $520 shipped for a set of four. They're not the cheapest tools to buy, but when thousands of pounds are literally suspended inches above your head, it's best not to cheap out."
That is pretty expensive.