I recently picked up two classic box cameras on eBay, an Agfa Cadet and a Kodak Brownie Six-20. Both cameras were inexpensive, around $10 each, shipping was the same price as the cameras. The cameras are from the 1930's and still work using the standard 120 film, producing 6x9 negatives. Unfortunately the Kodak uses 620 film which is only a different size spool but the same film.
Using these basic cameras is a nice change of pace compared to all the features of today's modern cameras. They have one aperture setting and one exposure setting. The quality of the photos have a nice soft classic feel to them. A different and unique aesthetic than the razor sharp expensive lenses.
View some Sample Photos