I got a Desert Spring inline humidifier.  Works quite well.  I only set it to like 15-20 in this weather though otherwise the windows freeze up.  It somewhat helps with my psoriasis.   I actually noticed a difference in past few days as I set it a tad higher.  
My house is super inefficient.    Mostly the main floor.  When they built it, they never used tape on the vapour barrier.  One of these days I need to remove all the drywall and redo the vappour barrier.  Big messy job though, but at least they used nails so it does make it easier to remove.  I got a new patio door a few years back so ended up doing that section.  Some places were missing insulation completely.