Welcome!
There are a number of good threads on this in both this forum and the Questions - Accessories forum. With that being said, how many cigars are you trying to hold (aka what size cooler do you want to replace)? Beads work great for smaller size humdors such as desktops and small cabinets but for anything much larger or anything you want to be able to go in and out of frequently you may want to consider either a Set and Forget from Stabil or a Cigar Oasis XL both of which are active humidifiers.
Personally, I have a Republic Humidors 150 ct. Glass Top model I found on the bay and it works pretty good for me although I would have gone bigger had I had more foresight...