A new book that dishes about the 2008 presidential campaign is flying off Big Apple bookstores’ shelves, but take heart — a new shipment is due in today.

“Game Change: Obama and the Clintons, McCain and Palin, and the Race of a Lifetime,” written by John Heilemann and Mark Halperin and published by HarperCollins, went on sale Monday.

Yet when The Post called two Barnes & Nobles in Manhattan and one in Brooklyn yesterday, they were already sold out.

After multiple reprints, there are now 300,000 copies. The electronic edition is expected to debut Feb. 23.