The Cape Cod-inspired house, built in 2008-09, sits on more than an acre with ocean views, an expansive lawn and a swimming pool with spa.
"Deal or No Deal" was canceled last year. Mandel, 56, is now an "America's Got Talent" judge. He was the voice of Bobby on the animated series "Bobby's World" (1990-98) and was on "St. Elsewhere" (1982-88).
Multiple Listing Service records show he bought the property in 2006 for about $3 million.
Mandel declined to comment.
Matt Rapf of Prittchett-Rapf Associates, Malibu, is the listing agent.