It turns out we aren't the only ones secretly stockpiling our favorite cosmetics in case they're ever discontinued. When Bobbi Brown discontinued the Sheer Lip Color in Plum Stain, fashion designer Carolina Herrera bought up every tube she could get her hands on. Bobbi Brown took the hint and re-released the shade, naming it Carolina in her honor.

Recreate Them
If you're looking for your own favorite discontinued products, there are steps you can take that don't involve setting Google alerts or simply stalking the brand's Facebook pages. Companies like Three Custom Color allow you to recreate your favorite discontinued cosmetics. Simply send in a sample of your product approximately the size and thickness of a dime (if your product isn't already in their database) and they will analyze the color, texture and coverage to recreate your product. Your information is then stored in their database, so you can order the next time without a sample.

Reach Out
Cosmetic companies understand how seriously their customers take a product being discontinued. Estée Lauder companies (which include Clinique, Bobbi Brown, La Mer, MAC and many others) have created a program called Gone But Not Forgotten. Simply give them a call, let them know the product you're searching for, and they will track it down for you, sending you as many as six pieces at a time if it's available. Some companies don't have programs like this set in place, but have customer service teams that are perfectly receptive to inquiries about discontinued products.

Scour the Web
When all else fails, I turn to websites known for selling discontinued products by the bundle and stock up. Amazon and Ebay -- as well as sites like DiscontinuedBeauty.com and BeautyEncounter.com -- often sell products by the case or in smaller bundles. A note of caution: never use products that aren't factory sealed when you receive them.