If you are looking for a car, the Civic Hybrid and Prius Hybrid are candidates. I don't see why either can't be flat towed. I have started to see both models on used car lots, so you may be able to pickup a good value on a three or four year old car.

If you want a little more luxury, the Accord hybrid and Camry hybrids are next inline.

I have, on one occasion, seen a 4WD Escape hybrid being towed, but I can't remember if it was on a dolly or flat.

Good luck.

-Charlie...