I've seen them available at auction in the past.

https://autoauctions.gsa.gov/GSAAutoAuctions/

https://www.govdeals.com/

https://www.publicsurplus.com

https://craigslist.org

Yup. I saw one parked next to an ice cream truck last summer. Exact same truck.

Yes, here was one: https://www.govdeals.com/?fa=Main.Item&itemid=6463&acctid=35...

Doesn't look like any are listed at the moment.