sentences:  A global demonstration program involving 600 Toyota Prius Plug-in pre-production test cars began in late 2009 in Japan and by mid-2010 field testing had begun in France, Germany, the United Kingdom, Canada, and the United States.The commercial version is expected to cost between to more than the conventional Prius and Toyota announced it expects to sell 20,000 units a year initially.Sales of the BYD F3DM to the general public began in Shenzhen in March 2010, and only 417 units were sold during 2010.