The ones that only have two wheels, up front, I guess they don't cut it?
Back in the day I had built plastic car models and some of those did steer (two with rack and pinion) but does anyone make those now? Just build the chassis, hehe.
You might have an excuse to visit toy stores and hobby shops if you're not a DIY type.
Well, probably not what the OP wants, but a servo for each front wheel could do the auto type steering, similar to the below bot. would take two servos instead of one, bit no steering linkage.
This is easily convertible platform will do planes, helis and quads too, by flashing the firmware using the free Mission Planner software by Michael Oborne.
It's kind of pricey by the time you outfit the sensors, but slick all the same.