Yes. Get a dry cabinet to protect your D90. Buy a dry cabinet with digital control and display.
I bought a Aipo 48 liters two months ago at $210. The distributor is in Malaysia, I made a call, confirmed the model, they delivered to me in Singapore.
I wanted a smaller one initially but the lady who took my order advised me to get a bigger one, I am glad I took her advice.
Buy a bigger one. You won't regret.