Attendance and winning percents, by team and by year, from Baseballreference.com. Team prices from Pay Dirt.
The files are all in MSExcel format. So, use your "Save Target As" command to save them to your hard disk.
Union Association, 1884 (Attendance, Winning Percents)
American Association, 1882-91 (Attendance, Winning Percents, Team Prices)
Players League, 1890 (Attendance, Winning Percents, Team Prices)
American League, 1901-02 (Attendance, Winning Percents)
Federal League, 1914-15 (Attendance, Winning Percents, Team Prices)