Harry Mangurian is on the verge of selling the Boston Celtics for $12 million to $15 million to a Boston-based executive with interests in travel and figure-salon businesses, according to published reports.

The Boston Herald and the Boston Globe reported yesterday that Mangurian is close to selling the team to Steve Belkin of suburban Weston, Mass.

"Unless something unexpected comes up, the team will be sold within the next few days. We just have some minor details to work out," the Globe quoted Mangurian. "I think he'll be a perfect owner for the club."

The Herald said the sale price was $15 million, including $10 million in cash and $5 million in deferred payments. The Globe put it in a range of $12 million to $15 million . . .

The San Antonio Spurs' Artis Gilmore was among 10 players fined $2,500 by the NBA for playing in nonsanctioned offseason exhibition games, a team spokesman confirmed. San Antonio's Gene Banks also could be among those fined, according to the Spurs . . .

The NCAA has added a fifth game to the opening round of the 1984 NCAA Division I Men's Basketball Championship.

The NCAA announced the fifth game will be used to narrow a 53-team field to a 48-team bracket.