Cheap reference books

I usually buy books from Amazon or Flipkart and they usually are cheap but the general quality of books are really not good. The hardcover books are generally overpriced in these e-commerce sites ranging from 1500 to even 2000. Can anyone recommend me some good places online to buy books of high quality and cheaper prices? PS - I also usually buy books from stores in airports and they have wonderful paper quality.

Is there any second hand book market in banglore? please recommend.

Boimela dot in (boimela.in) is the oldest initiative of an online Bengali books store, dedicated for Bengali books. People live out of West Bengal and miss Bengali books, wants to buy Bengali books online, boimela.in is the solution for those Bengali people. Mr Subrata Kundu started this portal in 2010 just to help people avail the facility to order a Bengali book which brings some happiness. We are trying to list all books which will release in Kolkata Book Fair 2021.

One of my friends is coming from the US. Except iPhone can someone suggest items which are less than 10k or 20k INR that he can buy from US. Suggestions for electronics, winter jackets, shoes and more are welcome. Just looking for cheap items that are costly in India but cheap there.

Any leads/platforms or groups to buy second hand furniture here in Bangalore?