Yes, you can get discount for the purchase of more number of domains at once.

Note that only when the limit of your total purchase exceeds Rs 7500, you will get the domains with the Slab 2 price. While considering the normal price amount, the slab 2 rate will be slightly less. However, you will not get reduction/discount for the domain available at the promotion stage.

Use this link to view the price of all the domains.