same here, i started with dry box also, but not the hippo one's, i used silica gel,
but accessibility and i keep changing gels in time when my shooting outings got very often...
dry cabinet is advisable but drybox is not bad, but hippo in a box for me is risky where u can't monitor the humidity...
I bought a dry box been using for almost 1 year now.
I did not bother changing those gels. In fact the color now is as pink as lipstick!
However, i gathered all the silica from the boxes of those appliances that we purchased. I even gathered all from my friends. Then spread out the pouches of silicas under the dry box foam. So far the humid is holding.
you money to spend on your camera gear and no money to maintaine it.Yet,you want to save money to get cheap things for your camera to prevent from getting furgurs.Then you've to prepare to send for service and its not cheap.