Sony announced the September 10th release of a new entry-level voice recorder, the ICD-B61. Its equipped with the minimum features, namely 512MB of internal memory, a built-in 28mm mono speaker, and provides a maximum output power of 250mW. It provides a recording time of around 301 hours.
Expect a price of 40.

http://www.akihabaranews.com/en/news-16511-Sony+Introduces+a+New+Entry-Level+Voice+Recorder%2C+the+ICD-B61.html