If they aren't sold in Sri Lanka (ask your local colleagues for a recommendation of a local physical or webshop) try a Chinese or American webshop like Alibaba or Amazon.
Things have been going rough from moving from London to Sri Lanka due to business transfer alone with my kid. As a parent, I'm being highly conscious of my kid's safety in this unfamiliar new environment. Since I cannot stay with my kid every time (due to my work schedule) , I'm planning to use a wearable GPS device for my kid just to make sure she's safe when I'm not with her. Where can I get a Kids GPS tracker in Sri Lanka?