When it comes to getting you to pay the highest possible price, online retailers have every technological advantage. But a new app called Paribus is starting to change that:
The service, which launched on the web earlier this year, connects to the email address you use for shopping online. When Paribus finds a receipt, it monitors the price. And if the price drops, Paribus negotiates for a refund — while keeping a cut, typically 25 percent, for itself. (You can temporarily lower the fee to 0, in 5 percent increments, for every friend you refer Paribus.) Its negotiations are automated: it sends emails on your behalf, fills out online forms, and varies its messages to make them sound more human.