This really depends on the provider and the service. A chiropractor would probably charge Costa Rican prices and that service would be much more reasonable than the U.S. From expats I’ve spoken to who retain a chiropractor and/or massage therapist, this is what they’ve told me.
But if you had an accountant doing your U.S. income taxes for you, they’d most likely charge you the rate they’d charge if they were based in the U.S. If a lawyer was working for you on something in the U.S. – U.S. prices. If they were working on a case for Costa Rica, setting up a corporation for you, for example, Costa Rica prices.
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