Buying individual sheets for a wet/dry mop like a Swiffer is expensive, but if you're just looking to a do a little dusting, This Old House recommends using some of the wax paper you probably already have in your house.
The wax paper will suck up the dust and dirt just like any dry mop would, leaving your hardwood floors nice and clean in the process. Wax paper is considerably cheaper than most wet/dry wipes and should work in a pinch. Hit up the full post at This Old House for nine more uses.
10 Uses for Wax Paper [This Old House]