Schools on the west coast

hi my wife and I have 2 kids that should be approx. 7 yrs old by the time we retire and hopefully settle in cr.  can anyone tell us what the cost of private school runs in cr?  any schools in guancaste area?

Tamarindo area has Country Day (US accredited) and La Paz (which I believe is trying for IB)

Private schools start at $300 per month, plus other expenses...