Saco Old Orchard Beach KOA, Maine - Rates, Dates, Payment methotds, Discounts RATES, DATES, DISCOUNTS, PAYMENT METHODS: Rates range depending on the time of year.  Spring and fall are the least expensive with tent sites starting at $28 for two people, kabin rates $52/$62, RV rates starting at $33 and on site rentals at $89.  In the summer, tent sites start at $36 to $44, kabins $73-$98, RV sites $41-$62 and on site rentals $109-$149.