NUUK, Greenland — You can’t put a price tag on this Arctic island — at least, that’s the message from the people who live here as rumors swirl of US offers to purchase it. “We are not for sale. Our land is not for sale. This goes back to our ancestors,” said Larserak Matthiessen, a Nuuk carpenter, told The Post Peter Kristiansen, a Nuuk stone-carving artist teaching locals his craft when The Post caught him, agreed: “I want Greenland to be independent, but we’re not ready yet. But I hope it