I just bought these hoping they would help with my humidity problem. I've been wiping the keezer out with a towel every single time I have had to open it and throwing in every silica gel packet I can find and it's not enough.
Thanks for mentioning this! The shipping to Canada is prohibitive but this encouraged me to look on amazon.ca and I found these ones:
https://www.amazon.ca/Ivation-Renewable-Rechargeable-Wireless-Dehumidifier/dp/B00TXSQ162
They are CDN $38.99 for a 2-pack or $24.99 each and seem to be about the same size as the Eva-Dry E333. I just ordered a pair that should be here in about 10 days. I've had a moisture problem in my keezer that is causing rust and mold and it would be nice to solve it!
I have a couple of these that I swap out whenever I remember. I don't have any problems with rust, though I'm in a relatively dry part of the country to begin with. If you're really having problems it's hard to beat a nice light coat of oil.
I picked up these a couple years ago and they helped a lot controlling the moisture level in my safe.