Sports Business 

Fan Cost Index   An annual report tracks the average cost of a typical family of four to attend a sporting event. Covers National Football League, Major League Baseball, National Basketball Association, and National Hockey League.

Rodney Fort's Sports Business Data Pages

Revenues from Sports Venues some free data

Sports Reference  statistics for four major sports: baseball, football, basketball, and hockey

The Statistical Abstract of the United States    The section Arts, Recreation, and Travel includes tables "Adult Attendance at Sports Events by Frequency," "Sporting Goods Sales by Product Category," and other statistics.

SBRnet Sports Business Research -  info

The Sports Industry. BERA: Business & Economics Research Advisor, Issue 3/4, Summer 2005.

"This guide is devoted to those sports that are the largest in terms of monies at the professional level and/or which attract the greatest attention from the general population."

Marketing

Advertising

SBRnet Sports Business Research -  info

"SBRnet is...a continuously updated resource featuring market research and industry news covering all facets of the industry…sports equipment sales, sports participation, sports broadcasting, sports sponsorship and sports marketing."

Encyclopedia of American Industries - info

SIC 7941 Professional Sports Clubs and Promoters

Encyclopedia of Emerging Industries - info

Extreme Sports

Encyclopedia of Global Industries - info

Sports Clubs and Promoters

First Research® - Industry Overviews - info

Professional Sports Teams and Organizations (SIC CODES: 7941, NAICS CODES: 711211)

Sporting Goods Retailers (SIC CODES: 5941, NAICS CODES: 45111)

Mintel Oxygen - info Each report combines data & analysis of the competitive landscape, market-share analysis and consumer profiles. Complex demographic issues are broken into easy-to-understand sections, explaining consumer behavior and demonstrating the structure of the market.  Reports cover aspects of fitness, well-being, sports, events and leisure activities, sports drinks, and sportswear. Examples of recent reports in Mintel:

Sports Enthusiasts - US

Sports Events Marketing - US

Athletic Shoes - US

Fitness Clothing - US

SportsBiz with Darren Rovell (CNBC)