Some resources used by homeschool parents may have referrals to local testers:

BJU press has a directory of testers: https://www.bjupress.com/store/TesterLocatorView

Classical Conversations does too: http://cctestingservices.com/

WHO (Washington Homeschool Organization) has this list of testers: http://washhomeschool.org/test-providers-washington/

...pronounced like the long vowel and first letter of the alphabet...