Prices reflect opportunity costs and help buyers make decisions. Cost and price are not the same, in economics terms. All other things being equal, they will choose to buy less. They will choose to buy more. Law of Demand.
Prices reflect opportunity costs for suppliers, too.
As the opportunity cost of supplying things to others decreases, people are willing to supply more. As the opportunity cost of supplying things to others increases, people are willing to supply less. Law of Supply. Ask if anyone wants them. Poll other students to see if they would make the same choice.