Soldddddddddddoldlddddddddddddd dddd it is
Beepi tends to offer the most, followed by CarMax.
Unfortunately, one can get a brand-new 2016 Volt Premier for $30K after tax credits and rebates, so it’s unlikely you’ll get close to that on your used 2015. 
True well I already got 9k back for it
I’m just trying to get ideas where I can get the most out of it
Unless you can find a sucker…er, generous buyer on craigslist, Beepi is probably your best bet.