We are available on email (books@umext.umass.edu) and telephone (413-545-5227) to answer your questions. Payment can be made by credit card over our secure portal.  To purchase pesticide study materials by check at a discounted rate, please visit the Pesticide Education site for an order guide at https://www.umass.edu/pested/study_materials/index.htm Please note that the bookstore will only ship to addresses within the United States. Orders for multiple copies are NOT eligible for RETURN.