I hope I'm not repeating myself here, but it's not a bad time of year for attention to guitar humidifiers.

Though I use several Kyser brand soundhole humidifiers, and I like them, there's a cheaper way. An old plastic 35mm film canister with several small holes drilled in it, and a damp sponge inserted in it, works well as a humidifier. This can be placed in the case, or suspended inside the guitar by cord or velcro (love that stuff) if like me you keep your guitars hung up. So long as it doesn't drip it will work as well as any store-bought solution.

Check it every day or two, depending on the weather, and refill as required.

Mooh.