Oklahoma City Thunder forward Kevin Durant has the second-best selling jersey, followed by Kobe Bryant, Carmelo Anthony and Derrick Rose. James' teammate, Dwyane Wade, is No. 7.
The Heat are second in the league in overall jersey sales, behind only the New York Knicks. Miami is coming off an NBA championship run that culminated with the defeat of Oklahoma City in the NBA FInals last June. The Heat reached the Finals in each of the last two seasons.
The Heat are off to a 10-3 start to the 2012-13 season, which has them atop the Southeast Division. James is averaging 25.2 points, 8.8 rebounds and 6.5 assists per game and leads the team in all three categories.
Miami resumes play on Thursday against the San Antonio Spurs.