Porsche Guy, being an aquarium keeper you might actually have a leg up on these guys for creating humidity... cheap trick if you have lots of old aquarium junk laying around...
Get a deep bowl od distilled water, and drop a VERY FINE air stone into it, attatched obviously, to a spare air pump you have lying around... put the bowl near your sundew, and make sure it doesn't splatter all over the plant...
The air coming out of the water will be very humid because of how finely it was broken up by the air stone, this can raise the humidity in a terrarium 10 100% easily within a few hours, but is ungainly and ugly compared to an ultrasonic humidifier... but any how, if you need to raise humidity temporarily aroudn a plant, give it a whirl.