Someone was also selling similar items via Amazon in the past. They are no longer available now.
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Yeah, I saw that on Amazon. There's also kind of a
neat item whereby you can hide your Ledger, though obviously this isn't anything like what OP is looking for.
Yeah I found that one as well while searching, but since it isn't waterproof I didn't post about it.
The aluminium pill bottle seems to be the best option so far. Since we are talking about a price range of $3 to $5 it is good for the OP to see what the cheapest alternatives go far, and try to aim at something close to that.
