I see you are based in Tennessee. I don't know how to get it there.
The best way would be to buy the book through Books of Bengal/ReadBengaliBooks (if you have friends based in India/Bangladesh) or Rokomari/Batighar (Bangladesh). I see it for sell here- https://booksofbengal.com/in/product/9789848825754/ . So when a friend has received it, I would recommend they FedEx it to you. (India only- https://readbengalibooks.com/k29780000000098.html - I can vouch for ReadBengaliBooks)
Is there a purchase link to this book, you could share? I was unable to find this on Amazon.