This page has a pretty comprehensive list of state incentives AND fees:
http://www.ncsl.org/research/energy/state-electric-vehicle-incentives-state-chart.aspx
Looks like only NJ and WA have sales tax exemptions.
http://www.ncsl.org/research/energy/state-electric-vehicle-incentives-state-chart.aspx
Looks like only NJ and WA have sales tax exemptions.