Some schools offer the ability to take single classes by paying on a per credit hour basis. The reported price per credit hour and estimated cost for one class at Purdue University Main Campus are as follows. Per credit costs are for reference only as many schools will not allow students to pay by credit hour.et Price. The net out-of-pocket total cost you end up paying or financing though student loans is known as the net price. The reported Purdue net price for in-state students $13,541* for the 2013/2014 academic year. This net price includes housing and meal expenses.