About $50, I can also build it because I own rpi 3b and I have seen for example seedsigner
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Seedsigner is great. Build your own device. I am unaware of anything under $65 or so that is reputable. There was an issue in Brazil, I can't find the link to the story, where a scam company sold hardware devices for $20 that were malware infested and robbed everyone. Also as I'm sure you know, don't buy a hardware device from a 3rd party.
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Currently I saw that ledger has a promotion (-30%) on 3 color variants of Ledger Nano S. With taxes in EU it comes out to about $60.5.
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It's not open source or bitcoin only, but you could do worse.
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Ledger is a fairly popular and proven hardware wallet. Of course, there was an affair some time ago with the Ledger Nano X and the extraction of keys from the devicešŸ¤£
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Yeah there was that, and the email exploit, now the recent recovery scheme. They've innovated in ways and done things that the industry has copied, but for me its the closed-source thing which in this space immediately signals bad actor
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not always something with closed code means something worse, often such a technique is used to prevent various attacks
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Yes for various things, but not when self-custodial action is the goal.