You always want what you can’t have — especially when it comes to beauty products. That’s why we’re getting the inside scoop from your favourite retailers on what’s selling out right now, how to sign up for waitlists, and where to go to find the next best thing. Because if everyone’s buying it, you know it’s got to be good.Whether she's getting inked or changing her hair colour for the umpteenth time, Kylie Jenner has a dynamic beauty history — one that's been well-documented on this site. But nothing has caused more of a frenzy than the social media star's coveted lips — and the shades with which she adorns them. Case in point: Jenner's sold-out Lip Kit and gloss collections When Jenner first launched her line of liquid lipsticks and matching lipliners last November, the entire stock of product sold out immediately, and dozens began to resurface on eBay for more than 10 times their original price. The online explosion occurred once again when Jenner dropped her trio of glosses last week — they retail for $15 (£10) each on her website.We're not at all surprised by the popularity of Jenner's cosmetics debut, not only because of her star power but also because of the quality of the products . The Lip Kit shades — there are now 11 — are trendy but wearable, and the formula is opaque and long-lasting.Unfortunately, all of Jenner's shades are still out of stock, but you can follow Kylie Cosmetics' Instagram account to keep tabs on the supply (or hop on her app for first dibs on restock information). If you simply cannot wait to start sporting the hues, however, we've gathered a few alternatives that could pass for the real deal. Check 'em out, ahead.