Homemade Proofer

Hi all, Living in the desert of Palm Springs where our humidity is usually around 15-20% I find it hard to keep my sourdough from drying out. I have tried the Oven, Microwave, box and so on and really haven't had the success I wanted.  So poking around TFL and the internet I found for under $50 I was able to roll my own.  I am pretty sure you can do it for less if you buy some of the supplies online.