Since production has ceased on the Th!nk in the US, they are clearling out about 150 vehicles still remaining on hand. I have found them offered as low as $20,000 (info on request).
I don’t want to post any ‘for sale’ info, but you can get more information from this article from Green Car Reports: Discontinued 2011 Think City Electric Cars For Sale: $22,500
It could be a great deal, as long as one realizes there is no longer a company behind it for support.