Deal of the Day This is the one thing on sale (out of many things on sale we write about) you should buy today. Read more here . Photo-Illustration: The Strategist; Photo: Retailer Dior’s Nail Glow polish is one of those cult-y beauty items that seem to withstand the test of time. But its hefty price point — $32 per 0.3-ounce bottle — and recent reformulation have left some loyal users on the hunt for a replacement. Beauty columnist Rio Viera-Newton thinks she’s found it in Butter London’s