What Are The Side Effects Of Qvar?

Hello my son is two and half and he is on qvar . I have insurance but I have to kick out 2,000 before I can get my son meds. at a lower price. For a three months supply I pay 381.00 . I was wondering is their any way I could get these meds at a lower price. And these meds are for children that are five years old with this hurt my son growth or have any other side effects coming up.