I use this guy - https://www.amazon.com/gp/product/B00UBNWLHQ/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1
Leave it in my Amazon Basics safe.
That actually sounds like an awesome idea.
I predict a lot of people will get this: https://www.amazon.com/gp/product/B00UBNWLHQ/ref=oh_aui_search_detailpage?ie=UTF8&psc=1
Probably one of my best cheap purchases.