What are the best creams for diper rash that I can find at the store?

Find rash cause. I would try to find the cause of the rash first. Type of diapers, wipes, scented creams, soaps? With that said, find a cream with the least ingredients possible and that creates a good skin barrier. Any cream that contains zinc oxide will provide a good barrier. Also let your infants diaper area air dry and avoid using wipes. Cleanse the diaper area with warm water and a gentle soap.
Aquaphir. I like aquaphor because it's thick and provides a good barrier between the wet diaper and the skin. If the rash persists more than 3 days it may be a secondary yeast infection and you may need to consult your doctor.