Ok, this one has been posted, but it may not've been seen and it's a good (long term) problem solver in a pinch. If you have beads, there's not always a good way to put them in a smaller humidor unless you order the tube as well.

I simply took an aluminum tube - La Aurora Preferidos - and punched holes in it with a push pin. A tube with a screw cap would be better (but remove any cedar lining first). The holes are plenty small enough to keep the beads in. Then filled the larger half of the tube to within 1/4 inch of its rim, added distilled water, and put the top 1/2 on. Voila, a home-built humidifier that kept a tuppidor (around 40-50 cigars) at 70% rh at least 3 weeks without adding more water. It lays there with the cigars perfectly, didn't cost a dime, and satisfied my occasional need to recycle.