Hi Tony & Nicole
It's not quite as cheap as hiring a nanny I'm afraid!
Admission fee for Pre-Kindergarten 3 is $350 (this is a one off fee for joining the school).
Then there is an annual registration fee of $400.
The annual tuition fees for 2007/08 are $3500 for a full day (8am-3pm)
So your initial payment will be $4250 for the entire year (there's normally a 5% discount on the total amount if paid early in one payment). Obviously if you're relocating in Jan, the tuition fees would be pro-rata, but the admission fee would remain the same (not sure about the registration fee, think they may adjust that a bit). They do have payment plans, but all fees are generally payable by 15 December, so if you join in Jan I think you'd have to pay the full amount.
There is a cafeteria at the school which serves a mid morning snack and lunch which includes healthy balanced meals with vegetables and fruit (there's a variety of food served from all different cultures so the children get to savour a variety of flavours). Cafeteria fees are paid quarterly (to give you an example the nursery cafeteria payment for Oct/Nov/Dec is 5325 pesos which is approx $163).
The International School is the probably the most expensive school in this area, but I do like the standard of the facilities there (very good library, computers etc) plus it's only 5mins from where I live. However, there are other very good schools in the area which are substantially cheaper such as Garden Kids (Sosua) and The Learning Centre (just before Cabarete) which both have very good reports from lots of satisfied parents. My eldest daughter attended The Learning Centre from Sept-Jan and I was very happy with the standard of teaching there. I only moved to the International School because of it's proximity to where I live, and I the fact that I was spending $200 a month on petrol to and from Cabarete so any savings in school fees were cancelled out! Also I felt that the facilities at The International School were far better as The Learning Centre had recently moved premises and not really established itself on it's new campus with regard to sports facilities, library, etc.
Hope this helps, unfortunately I can only give you info on Sosua/Cabarete area. There is a 'sticky' on private schools which can be quite helpful if you're looking at other areas. Also, International School (ISS) and Garden Kids both have their own websites if you want to take a look.
Oh, I was gonna suggest you contact Matilda if you were looking at Juan Dolio, but while I've been rambling, she's already posted! She's a star!
Oh, and one other thing, don't forget birth certificate and vaccination records for schools as you won't be able to register without them.