Ruling on entering draws after buying goods

Shaykh Ibn ‘Uthaymeen (may Allaah have mercy on him) said: 

Nowadays traders and manufacturers have started to offer too
many products, and the people are drowning in stuff. As we see, people have
a lot of containers in their houses, or several types of clothing. The
companies, as you know, are purely materialistic. They offer prizes to those
who buy from them and there is nothing wrong with that, subject to two
conditions: 

1 – That the price of the item should be the real price,
i.e., the price should not be raised because of the prize. If the price has
been raised because of the prize then this is gambling and is not
permissible. 

2 – A person should not buy the product because he hopes for
the prize. If he buys it only because he hopes to win the prize, and not
because he has any need of the product, this is a waste of money. We have
heard that some people will buy a carton of milk or yoghurt, which they do
not want or need, but they hope to win a prize. So you see them buying these
things then throwing them away in the marketplace or outside their homes.
This is not permissible because it is a waste of money and the Prophet
(peace and blessings of Allaah be upon him) forbade wasting money.