Most masseuse's in Juan Dolio charge about RD$350-400 for a message. I'm not sure of the exchange rate at the moment (but I hear it's around 21-1US$) so that would be about $20US per 40-45 minute session. Last 1 hr massage I had in March I paid 500 pesos for. You'll find things a little more expensive in the Boca Chica/Juan Dolio area (I haven't a clue why except that maybe the quality of the hotels is higher thus tourists with more $$$ to spend or just because it's more a tourist area and not a "local" area so we tend to get charged higher "tourist" prices for everything!)