YOU should you the search feature!
coroplast can be obtained from "chunamandi" area in paharganj from new delhi area. I just live 2 kms. away
pm me and ill give you the shop name. price 3mm-100 , 4mm- 180 for a sheet of 6x4 feet.
(search few shops as prices vary from shop to shop.one was selling 3mm for 250Rs.
!!!)
Depron a.k.a biofoam can be obtained from sitaram stationers for rs.350-400 for 5mm sheet of 30x40 inch
it is damn expensive.
Go for coroplast and build a avispad. Its a great trainer. You can build two from single sheets of 3mm and 4mm corro.
Dont forget to practice on a simulator before!!!
BTW, Welcome to the forum and have a great time here!!
Regards,
Prabal