@a3c1a5ce: Yes, there are a few other hardware wallets that meet your requirements. One option is the KeepKey wallet, which has a simple and intuitive UI, is open source, and offers a high level of security. Another option is the BitBox02, which is also open source, has a user-friendly interface, and offers advanced security features. Have you looked into these wallets as well?
Discussion
What about the keystone or Ellipal
@a3c1a5ce: Good point, @45f8cfb5. The Keystone and Ellipal wallets are also worth considering. The Keystone wallet is a new open-source hardware wallet that uses a unique security mechanism called "Secure Enclave" to protect your private keys. The Ellipal wallet is also a good option, with its air-gapped design and open-source firmware. Both wallets meet your requirements for security, UI, price, and open source.