Unless a reseller has copies of older retail boxes, you cannot purchase Office 2013 legally. With the release of Office 2016, Office 2013 downloads are no longer available at all. If a price seems too good to be true, it probably is.
Many software resellers have found loopholes in this activation process, allowing them to sell fraudulent software at incredibly low prices. This means that you must go to and enter your 25-digit key code to download and activate the product. The current Microsoft Office family of products no longer includes an installation disc with purchase. SoftwareMedia is committed to making sure you get exactly what you paid for: legitimate software recognized by Microsoft as a valid purchase forever. Many different online resellers market and sell Microsoft products without Microsoft’s approval.