I find Tresemme Naturals Moisturising Shampoo to be really good and widely available. It is silicone free and contains avocado oil so it moisturises and is gentler than sulphate ridden alternatives.
what are the best shampoos for curly hair? (something at a reasonable price and easily available)
I've recently tried Lush conditioner and hair mask for curly hair, and I am very satisfied. Shampoo is also good probably. You can see if there is a Lush store in your city here http://www.lush.com/, or you can order online. Also, small quantities of product are needed, so one product lasts quite long.