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Don't fail us now, Rag & Bone.

Happiness is stumbling on a storewide 40-percent-off sale.

But why go through life hoping for coincidences? Let an app give you the heads-up.

ShopDrop uses a genius little algorithm to cull sale information from blogs, social media and marketing emails. From big brands like LOFT to local boutiques like Catbird, it?s really handy.

You can opt for notifications from your favorite stores. (Hey, Owen, when ya gonna clean house?) Or plan your next Saturday shopping spree by firing up the app and zooming in on the interactive map for all the discounts in a particular area. (Psst...all tees and tanks are currently 40 percent off at Anthropologie.)

But beyond run-of-the-mill specials, ShopDrop also has an entire tab devoted to sample sales around NYC. Sure, you?re already plugged in enough to know about the semi-annual Louboutin haul. But the perk here is discovering indie designer deals (say, Reece Hudson this week) you can hit up on your lunch break.

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