Inside InStyle's new May issue are 151 incredible hair, makeup, and skin products featured on our expertly-researched 2011 Best Beauty Buys list. The lineup is so lustworthy, that we're giving tons of the items away today! Today's prize includes 13 makeup Best Beauty Buys, including products by Shu Uemura, Maybelline, and Guerlain, for a total value of over $300! Simply follow InStyle on Twitter (@instyle) and be the tenth person to retweet a special message (we'll tell you which one!). Pick up the May issue of InStyle for the complete list of 2011 Best Beauty Buys, on newsstands now!