Walmart – the world’s largest grocery retailer – is looking to reinvigorate its online sales through the acquisition of e-commerce start-up Jet.com, according to a report in Tech Crunch. Quoting “a source with direct knowledge of the deal”, Tech Crunch reports that Walmart is set to pay up to $3 billion for the online retail specialist, which began operating last year. Based in the US, Jet.com offers a broad range of …