Simple and weighted average NBA ticket prices from Congressional hearings and TMR's Fan Cost Index. The files are all in MSExcel format. So, use your "Save Target As" command to save them to your hard disk.
Simple Average Series: 1952-53 through 1956-57 and 1970-71
Weighted Average Series: 1970-71 and 1991-92 through 2005-06, 2007-08 and 2008-09