I guess if its just for putting in the car then any mid fold generic folder would do.
Also depends how far you plan to ride it. Many cheap folding bikes are terrible to ride any further than a couple of miles.
Brompton provides a small folder package that will pretty much let you take it anywhere (bus, train, car etc) whilst maintaining ridable comfort for longer distances.
Here is mine when it was new
And fitted will a small assist motor on the front
Nearly two years later and having covered some 2300 miles on my 10 mile round trip commute to work, it has transformed my work commuting habit.
I purchased mine when they were only £600 and on our bike to work scheme. Having said that if it where damaged or stolen I would buy another one in a heart beat.
Regards
Jerry