Bitwarden ($10/year Premium Bitwarden plan[1] or self-hosted Vaultwarden[2]) and KeePass[3] are also password managers that support TOTP authentication. They are open source and less expensive than 1Password.

A single password manager should only be used to store TOTP secrets alongside passwords if you're comfortable with both of them being accessed from the same devices. It's possible to store your TOTP secrets in a Bitwarden account or a KeePass file, and your passwords in another account or file, hosted/stored in different locations.

[1] https://bitwarden.com/pricing/business/

[2] https://github.com/dani-garcia/vaultwarden

[3] https://keepass.info/download.html

I hope you're not storing your passwords in there too