Jess and I buy a lot of our stuff from Amazon, as it’s far cheaper than neighborhood stores here in NYC. And, more broadly, we tend to do most of our shopping online, which is usually faster, more convenient and less expensive than our brick-and-mortar options.

Online prices change frequently, and sales and coupons have a Murphy’s Law-esque way of popping up the day after you need them. Fortunately, most sites will retroactively match lowered prices or sales and discounts if you email to ask. But, in reality, it’s almost impossible to keep up with deals on future purchases, much less past ones.

Enter Paribus, a great new site that chases those potential discounts for you. Connect Paribus with your email account, and it will catalogue your purchases, then keep an eye on whether they qualify for partial refunds down the line. If they do, Paribus’ team will follow up on your behalf. Paribus gets paid only if they find you refunds (they takes 25%, and send the other 75% your way), so there’s only upside to trying it out.

Sign up for Paribus, and get what you’re owed.

[I discovered Paribus through today’s Product Hunt email. If you like cool new stuff, head on over and sign up for their daily newsletter. Each morning, they send along a crowdsourced list of the coolest new software, hardware, books and courses in the tech world. It’s a fast way to stay on the bleeding edge.]