Here's another data point - CPO Rex for under $19,000. Granted, it has no options other than heated seats. (In Santa Clara, California)
http://cpo.bmwusa.com/certified/2014-BMW-i3-WBY1Z4C54EVX63396
2014 BMW i3
Price: $18,983
KBB.com 10 Best Green Cars. Only 23,642 Miles! This BMW i3 boasts...