Styrofoam in Chennai

Hey, this is my first post as a registered user because I’m in need for some styrofoam, in a place far, far away (from my home anyway). I’m doing an internship in Chennai (India) and want to make some models, but it’s rather difficult to explain to other people what sort of polystryrene foam I exactly need. I only know it as lilac design foam…

Anyone here who knows a shop where I can get it, or what type of foam generally is used for model making?

thanks, I have been asking around and it appears to be available in Puna, I believe that’s on the other side of the country S-: