mmab posted this in another thread regarding florist foam:

"It's called "Oasis" at most florists and craft stores. There are two types. One is a dry type and made for artificial flowers. The other is the wet type for real flowers. You want the wet type. Oasis is a great material for humidifiers

My buddy got an inexpensive humidor a while back and the Oasis in the humidifier puck was either cheap crap or the dry type as it wouldn't soak up any water.

Go to any craft store and ask for wet type Oasis florist foam. You can recut a section easy. It cuts easier than butter with a steak knife or razor knife. When you soak it you can see the color darken and also see the water absorb into it.

You may want to consider making your own humidifier using Oasis and some type of holder for it. Just be sure it won't leak or contact you cigars directly."