At least one Suffolk legislator thinks the flat-broke county needs to buy a boulder, but that would only trap the budget between the rock and the hard place it inhabits.

Mount Sinai Democrat Sarah Anker proposes that the county purchase a property that includes the second-largest piece of glacial erratica on Long Island, a 3-story-high mass in Rocky Point that might have given the community its name. The Island’s biggest such protuberance, Shelter Rock in Manhasset, is already protected because it is on the former Whitney estate, Greentree, and controlled by a nonprofit foundation.

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Anker came upon the boulder while campaigning last year and was enthralled. The owner of the 1.3-acre lot and house says he’d sell “for the right price,” and that a real estate agent told him the property is worth $300,000. He paid $107,500 a year ago.

With uncontrollable county deficits stretching into the foreseeable future, this purchase would be a bad idea, not least because this rock isn’t going anywhere. Unlike so many other Suffolk inhabitants, it can’t flee to a golf condo in North Carolina to escape the county’s woes. — The editorial board