Answer:
You can buy Model 20 Swingers for $10 or less.
More Information
The Model 20 was part of the Swinger line, manufactured between 1965 and 1970. This was a small, lightweight, entry-level camera with a plastic body and single element plastic lens, marketed not for its quality but for fun and convenience. The original retail price was $19.95.
Polaroid's Model 20 Swinger used Type-20 Land roll film, which was discontinued in the 1970s then replaced by Type-20C, which was discontinued in the early 1990s. Neither film is available. These were also mass manufactured, so they are plentiful on the secondary market, making them virtually worthless.
[December 2010]