Maybe there’s a university somewhere within driving distance that has a harp program? I drove 3.5 hours each way to get my harp regulated for the first free one, but the next time will be at a local university where the same guy (Tom Bell) makes a regulation visit
Generally, if you are playing professionally full time and your harp gets used a lot, you’d have it regulated at least once a year. If you’re a semi-professional, then every 1-2 years, if you play for yourself then every 3 years.
Enchanted Harp in Puyallup, WA arranges regulations for their harp community.