If you open a bookstore, where will you go without going to the book market? Publishing house?
If you go to a publishing house, first of all, people will not cooperate with you, and the discount for taking books is not low.
I recommend you go to the book market to get the goods. For example, the book I have here is 1-3 fold. If you get the goods in a publishing house, the minimum discount is above 20%, and people haven't done it yet. Moreover, the market variety is also very rich, and books from various publishing houses are available.
I am a book wholesaler. You can have a look at my electronic catalogue.