They ARE really that good IF your hair "likes" them. My hair happens to love Dominican products and I've used them for years.
Most of the people using these products live in New York. NYC has a very high percentage of folks from the Dominican Republic, therefore the products are readily available here.
Someone posted recently about products being sold on Ebay so you may want to try there (it was Tropical Avocado Conditioner).
The ingredients most used in Dominican products are: Avocado, Aloe, Rosemary, Olive Oil, Carrot Oil & Milk & Honey and they don't tend to have as many chemicals as American products.