Has an NBA game ever ended 88-76?
Yes. NBA has seen a final score of 88-76 22 times. It first happened on January 12, 1952, when Ft. Wayne Zollner Pistons beat Rochester Royals, and most recently on December 17, 2012, when Los Angeles Clippers beat Detroit Pistons.
That makes 88-76 the 917th most common final score out of 3,189 that have ever occurred in NBA. One point away, 89-76 has happened 25 times and 88-77 has happened 25 times. Nearly all of its occurrences fall between 1980 and 2009.