That’s not under a $100 a month because it’s $3000 down. It’s closer to $122 a month but that probably doesn’t include the dealer doc fee or the acquisition fee. Maybe an Equinox LS could be had for under & 100 if you do a one pay lease
Aside from the Spark EV, which is region restricted and almost all gone anyways, you may be able to snag a barebones Equinox for around $100/month, $0 down (or pay just taxes and fees up front), if you qualify for every single incentive and the Costco money as well, and find a dealer very willing to deal.
Other than that, I don’t think <$100 is possible without extra money down.
Are you referring to the Chevy Cruze deals earlier this year? That was just a freak combination of events that led to those crazy low prices and it’s not normal.