A stamp set and some washers with a nut and bolt.

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I'm trynna recommend such brands. please specify brand names 🙏

I mean literally stamp you seed into the washers and put it on a nut and bolt.

https://blockmit.com/english/guides/diy/make-cold-wallet-washers/

That's just seed backup. Not an offline signing device.

I don't need a signing device for cold storage. It only goes in. It doesn't come out. That's what makes it cold.

Yes, you and the person you replied to are talking about two different things.

Nevermind, I misread.

That's about as cheap and secure as it gets.