Travelport is a company that focuses on e-commerce for travel purposes either by land or air. Users can benefit from this SDK that is available by request to create applications and increase sales. Technical requirements include Message Envelope SOAP 1.1, Message Transfer HTTP 1.1, Encryption SSL 3.0, and Web Service Description Language WSDL 1.1, an XML-based interface definition language. See more of what the SDK can do for a travel project at https://developer.travelport.com/euf/assets/developer-network/pdfs/desktop_SDK_factsheet.pdf
Shopping isn't necessarily particular for this audience, but have you ever tried to help your parents or non tech-savvy friends try to shop for a computer? SalesClark aims to combine several online shop APIs (such as Amazon and Commission Junction) to build a tool that you can sit your mom down with and help her find a computer.
MyBantu is an interesting little mashup, available as an iPhone app, an Android app, and a website. Its goal is to make shopping for anything, especially restaurants and movies, easier and more social. It uses Yelp API, Netflix API and various others to make it happen. It's very similar in idea to Siri, the "ultimate mashup" that Apple later gobbled up in the largest mashup acquisition ever.