Ask any woman to name her must-have beauty product, and chances are she'll have an answer before you've even finished the question.

Whether a signature fragrance, eye shadow or shampoo, the cosmetics we use shape who we are, and how others perceive us. Procuring the perfect product is a coup, but what happens when the powers-that-be decide to stop making it? Losing access to a beloved (and now discontinued!) beauty product can send us into panic mode, but resourceful shoppers can still stock up on what is no longer "officially" on the market.

Go Straight to the Source
Want in on a little-known secret? Many popular brands provide direct assistance in connecting consumers with discontinued items. Through Estee Lauder's Gone But Not Forgotten program (1-800-216-7173), if your product has been discontinued within the prior 24 months and is still in stock anywhere, it's yours to buy. With almost 20 participating brands under the Estee umbrella, including industry giants like Clinique, Bobbi Brown, Jo Malone and Bumble and Bumble, there's a good chance you'll find what you need. To see if your manufacturer offers such a program, check the company website or contact customer service.

When in Doubt, Surf the Web
If you can't get your product directly from its maker, the Internet is packed with resources that specialize in selling rare and discontinued items. Websites like hardtofindbrands.com and fragrancex.com constantly update their inventory, and merchandise is often available at a reasonable price. Consumers can also hit the jackpot on drugstore.com, which has worked with brands like Max Factor and Q-tips to create exclusive distribution runs of past cult favorites. In such instances, supplies are limited, so it pays to check in periodically and stock up when you see what you want. You may also find luck on auction sites like eBay, where you can bid on or purchase what might be the last remaining supply of your item. Savvy sellers know that they can raise prices once the product is no longer made, but for those can't-live-without essentials, it may be worth shelling out a few extra dollars.

Miss It? Match It!
Can't seem to find your product anywhere? Don't worry, all hope is not lost. Whether in stores or online, niche companies like Giella Custom Blend Cosmetics and Three Custom Color can perfectly match any hue, from lipstick to foundation to nail polish. Having already recreated thousands of shades, there's a good chance that these companies have the formula for your product on file and can ship you a supply within a few days. If their makeup artists haven't yet worked with your exact line, simply bring –- or mail –- in a sample of your current supply, and the experts will get to work recreating it. Order fulfillment times vary, but if you can't wait, rush options are available.