In our part of Hyderabad, that is in Bhel Township, curry leaves are no more offered free of cost. The sellers charge 5 or 10 rupees depending upon the quantity. Anyway, we don't have to purchase any of it as there are plenty of curry plants around our quarters. Wondering, who then purchases them. Just beyond the boundaries of our township, there is a concrete jungle, where forget curry plants, you won't find even a single blade of grass growing. And yes, there are some upmarket gated communities around, where you will do see some greenery, but then it won't be fashionable to grow curry plants there. It's from there that hundreds of residents, or may be thousands, come to Bhel to shop from the weekly fruits and vegetable market.
I remember, in my native Bengal, some of the vegetable sellers used to offer a little bit of coriander leaves and green chilli all free of cost, along with the other vegetables that we used to purchase. Don't know, whether the practice is still popular or not. Curry leaves are not commonly available in the markets in the east.
Patience and perseverance pays