Macadamia nuts are high in monounsaturated fat but are expensive compared to other varieties. Best deal I've found is at Costco under the Kirkland brand. Purchase in-store at a discount.
The following summarizes the carbohydrate and fat content for 1/2 oz (5-6 nuts).
Ingredient Carbs sfa mufa pufa tfa macadamia nuts 1 2 8 0 10
sfa (saturated fat), mufa (monounsaturated fat), pufa (polyunsaturated fat), tfa (total fat)