Ideally, you buy the parts and build it yourself. No one needs to know what you’re building or that you have a signing device. If that’s not for you, then there’s pleb run stores that sell the seedsigner. I pulled this list from seedsigner’s website.
SEEDSIGNER KITS / ASSEMBLED SIGNERS:
– EU/UK: GoBrrr, VULCAN, DIYNodes, BitcoinBrabant, Bitsaga
– USA/Canada: BTC Hardware Solutions (by project leader/creator)
– Brazil: StackBit
– Australia: HansMade
If you have any questions, let me know. I’ve been an advocate for the project since its release.
I will say if you plan to spend a lot on-chain and think you’ll be doing so quite often, then you might be better off with a device that holds the keys within the device and has a secure element.
I use Lightning for all my daily, weekly, monthly spending and receiving of sats. No hardware signer for that.
For cold wallets, the seedsigner is my recommendation. I can’t make a 2nd recommendation, but if I had to look into another device, it would be the BitBox.
I already have a Jade and ColdCard Mk3 and a Krux. They’ve been collecting dust for years.
You might also notice the seedsigner has a fantastic user base, too. We’re all tinkerers, and we love to help others.
I could type all day about it.