Nothing gets our hearts racing faster than the phrase "limited edition." Those two words can transform a product from one we're thinking about purchasing to one we need to have in our hands that very instant. Because once they're gone, they're gone. From the Derek Lam Estee Lauder collaboration to bling-y, spring-y palettes and fabulous gifts-with-purchases, these spring makeup kits would be covet-worthy even without the limited-edition status. But since they're only going to be around for so long ... you'll want to snap them up before they're gone for good.