Found in-store, $18.99 for 2-pack.
Dehumidifier is a bit misleading, since it is a desiccant, like Damp-Rid, but best part is when it fills up with water, plug it into an outlet for a few hours, and it works all over again!
Works great in my safe and in the basement.
Costco store locator [costco.com]
Next lowest price is $29.94 at Amazon.
Amazon link for reference only: https://www.amazon.com/dp/B00LVN7BM0