If you would like to purchase an 8-track tape for nostalgia purposes or perhaps to insert into the tape player of your restored 1965 Ford Mustang, the 8-Track Shack may be your preferred source. The company apparently has a huge inventory. Prices vary widely.
The 8-Track Shack catalog may be found at http://www.8-track-shack.com. The company also sells cassette tapes, records, compact disks, old video games, vintage radios and record players, and more.
Another source of vintage items is eBay at http://www.ebay.com.