Go to cars.com and then follow-up at the dealer site when you find a car you like. I would never buy a 3-4 year old Volt for $16-18k when you can buy an almost new one for $23-$25k. Our Chevy dealer in Santa Fe has a 2017 with 1,000+ miles for $25k and I suspect they'd negotiate some if you're serious.
As for safety, most of the "safety" add-ons are less than great. My greatest concern with all of my Volts has been how quiet they are under 15 mph and the damn mile wide A posts.
