Below are places that most likely sell Bible commentaries in Hindi. One website below has it online for free.
Bible Planet
https://www.bibleplanet.in
Christian Books India
https://www.christianbooksindia.com
Christianstore
https://www.christianstore.in/
Evangelical Literature Service (ELS) - India
http://www.elsindia.org
Free Bible Commentary
http://freebiblecommentarylanguages.com
Global Christian Store
https://globalchristianstore.com/product-category/christian-books/gospel/
https://globalchristianstore.com
God is Good Christian Store
http://www.christcart.com
Gospel in Chennai
http://www.gospelinchennai.info/christian-books-music-stores/
http://www.gospelinchennai.info
Gospel Literature Service (GLS)
http://glsindia.com
LifeWay India
http://lifeway.in/books?s_kwcid=AL!4443!3!250560540193!p!!g!!christian%20books&ef_id=WwIymQAABDH2nxiM:20180521024441:s
http://lifeway.in
Praise Cart
http://www.praisecart.com/books.html
http://www.praisecart.com
If you have any questions or need help finding a particular video, tract, book or any other Christian resource in any language of the world, please contact brianformissions@gmail.com