'05 Ford Freestyle - lowlights not working?

The low lights on my 2005 Ford Freestyle are not working. The bulbs are not burnt out, and all of the fuses seem to be fine. I was told it might be the "multifunction switch", but I'm having trouble locating a switch that looks like the one we have (there seem to be several different types). If anyone has some idea of where to find this type of switch (circular knob that mounts on the dash- not a handle on the steering column) and what it might cost, I would appreciate your input.