Using washers to save your seed phrase is also good, but it is a bit expensive. The full details and explanation were done by Fillippone in
this thread. I think it is secure and more easier to handle than paper, but the process is expensive.
There are ready made kits for that where you use a titanium plate instead of washers. Check out Stamp Seed. The whole set costs $120 which is less than a hardware wallet.
It's not really an expensive option for people who own bitcoin. Truth is, if you have a few thousand dollars in bitcoin you don't need any fancy backups. Just remember the password to your wallet and backup the whole file. If someone steals it they still won't be able to access your money and the password remains safe in your head.