FREE HUMIDIFIER TO GOOD HOME: get a container, put water in it, stick it under the lamps.
seriously tho, its near free dude, and gets the job done.
what i do is fill a 5-10gal bucket with water, 3 days later, i use that water on the plants, and refill the bucket.
It keeps the humidity up, but not too high (which can promote rot), and provides a reservoir of fresh water to use whenever you need to (just dont put ferts in until you need to use it)
Get a humidity meter too, if its still low, get another bucket, or one with a larger surface area, or stick what ya got under the lamps more.