if you are under budget constraint, a relatively cheap alternative is to get an air tight box, and put some silica gel in it. You need to change the silica gel regularly though, or fungus may start to grow.
A dry cabinet is actually similar to an air tight box, except it will automatically dry the cabinet if it detects that the humidity in the cabinet is higher than what you have set. Further, the dryer unit always automatically purge the moisture out of the cabinet unlike silica gel where the moisture is trapped in the silica.