Old hard drive connected to new computer

[Mike Sr 2019]

I'm interested in connecting my old hard drive to my new desktop and would like it to be accessible for future use. What inexpensive reliable case is available to buy? I want to stick in a case and keep it under the desk. Both units were/are running Windows 10. Most of the old data was transferred to the new pc - the exception of my 12 years of emails. Thanks.