To help you tackle what's sure to be the biggest beauty sale this spring , we've compiled a comprehensive guide, ahead. Some standouts? Flesh Beauty lipstick will be down to just $8 on the 20th, Mario Badescu's Drying Lotion will sell for next to nothing come the 30th, and cult-favorite mascara wands, like IT Cosmetics and Tarte, will be remarkably cheap throughout. You don't want to miss any of 'em, so keep clicking for every offer included for the duration of Ulta's 21 Days of Beauty sale.