In some cases, it’s better to purchase in bulk. I’ve had experiences buying in bulk that didn’t work out in my favor, such as when I’ve purchased food items that are perishable. However, items that will last for a longer amount of time are much better for making bulk purchases or purchases of a larger amount.
For instance, when I was looking into buying motor oil for my boat, I didn’t have to worry about the oil quickly going bad on me like I would with some types of food. Thus, I had no qualms about purchasing a Mercury oil 55 gallon drum, since I knew it would be able to last me for quite a while.