You may stop by the Register of Deeds office to obtain a copy for a fee of $0.50 per page. You need to know the name the property is in and the approximate year it was purchased or recorded.
For a deed of trust/mortgage, you need to know the Grantor. For a power of attorney, you need to know either the grantor or grantee and the approximate year of recording.
Certified copies are $5 for the first page and $2 for each additional page.
If you know the Book and page of the documents, you may request it by mail.