Exchange my ipad

Good morning,

I am Nandini, an Apple user. I have been using my IPad Air since 2014 which I bought in USA. I live in India and now I want to buy a new iPad, maybe IPad Pro but it costs a lot so I wanted to buy it in exchange of my current iPad. My iPad is completely functional except that my turn up volume button has broken else everything is perfectly working. So I just wanted to ask that is there any kind of offer that I can buy a new iPad in exchange of old one which I did not buy from India?

Thank you