Fresh curry leaves

Dunno about the suburbs, but I have seen them in Green Pepper, which is on Chaussée de Wavre 211 in Ixelles. But they are more likely to have them in the India shop which is just a few meters further down the hill, on the corner of rue du Viaduc.

They also have fresh fenugreek, which you don't so often see in other places.

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All the spices you need

there is a relatively small Asian supermarket in the upper part of Avenue George Henri in Woluwe Saint Lambert (to give you an idea in front of Partena).
Despite the small size it has tons of asian products and a very good selection of fresh veg/fruits/leaves.

Not sure in which suburbs you are living though

My local Brico had some curry plants for sale last weekend in their fresh herb garden section - a volonté then and must be a cheaper option in the long run.

Curry plants (which look likr rosemary but smell strongly of curry) are not the same as curry leaves, they have no culinary use that I know of.

Try the African shops near Port Namur metro.
They have lots of curry leaves and spices.