Where to get oil based paint?

Specifically Sherwin Williams or Benjamin Moore? We’re in the middle of a kitchen renovation, and my contractor just informed me that he can’t get oil based paint for our interior trim and doors (they’re already painted with oil based paint, otherwise we’d just use an alternative).

We only need 3 gallons. Anyone have any insider tips or know anyone selling second hand? We’re less than 2 weeks out from finishing this project and I’m 7.5 months pregnant. We’d really like to get this done and behind us before the baby is here. Any help is greatly appreciated!