Roundabout a buck per mile enclosed.
Some great private guys out there, and a lot of the Russian/whatever guys that couldn't care less about your car; been there.
Driveable car, highway gears, in good condition, done that and it was fun - because nothing broke and I had company.
Last car I bought, a buddy & I towed an enclosed trailer 1200 miles east, picked up the car, & got home in 5 days, staying in motels and eating well.
Cost me less than hiring it out, and we had control over pretty much everything but the weather.
I also wanted to see the car & do the transaction in person.

The Cheap vs Good rule applies to transport, but if the car's a project, cheap may be better.
At least CA-PA is a common & main route, I wouldn't expect much of a delay.