This story originally published in February 2019 and has been updated. If you ever wanted to own property at the Jersey Shore, now you can — but not just any property. A whole island. But good luck building on it. There’s a 19-acre private island for sale that costs less than some condos at the shore. For $125,000, No Man’s Island — just north of West Wildwood — can be yours. The price has come down from the original figure of $200,000 from two years ago. The completely undeveloped piece of land is located in the Grassy Sound in Middle Township between the mainland and the barrier island of th…