In this story it says
"Cheddar added 3.5 percent to US$2,964 a tonne"
Divide that out and you get $2.96 per kg of cheese - assuming that's what they're referring to in the story. That's some markup to get to $9 to $15 per kg in the supermarket... though I'm sure there are many expenses that go into it. I wouldn't want to buy a ton at a time anyway, I'm not sure I have anywhere to store it.