What is the ruling on participating in commercial incentive competitions that depend on purchasing products and then sending their vouchers to enter a draw to win monetary prizes?

Shaykh Ibn ‘Uthaymeen permitted commercial prizes subject to two conditions: First, the price of the commodity must be its true price, without any increase due to the prize; otherwise, it is forbidden gambling. Second, the purchase must not be solely for the anticipation of the prize without any real need for the commodity, because that falls under squandering money, which is prohibited.