Los Angeles is a mecca for beauty products, as there are many great beauty supply stores throughout the huge city. It is possible to find at least one great beauty supply store in each neighborhood!
In Santa Monica, the best beauty supply store is Number One Beauty, on Montana Avenue. All the locals go here for everything they need, from shampoo to make-up. The owners and employees are extremely knowledgeable about what products are best for each hair type. And, when you purchase products from them, they always add great samples of products that are perfect for your skin, or great for travel.
In West Hollywood, Wilshire Beauty is where to go for a product fix, or introduction to something new and perfect for your skin or hair. It's a well-stocked, open, well-organized store. The women who work there are extremely helpful and really know their inventory.
In Beverly Hills, Chroma wins the top prize. They are a beautiful, chic, salon with great make-up services and fantastic products. Not cheap, but worth every penny. Go here not just to buy make-up, but to get your brows shaped and other services.
In the Valley, Naimies is the biggest and best. Whatever you need, or don't even know you need but come to love, you'll find at Naimies. Naimies also has some of the lowest prices you'll find for every item by about 10%. It's like a supercharged Sephora, but with a larger variety of brands. Naimies even has a large selection of high end wigs, a salon, and a spa.
Of course, no list would be complete without mentioning Sephora. There are several Sephora locations throughout Los Angeles, from the beach to the hills of Hollywood. Sephora carries the high end make-up lines as well as their own, less expensive, product. Their staff keeps up with current trends and is more than happy to experiment with you. It's always a good idea to try make-up on before buying, and that's what makes Sephora shops great - the ease with which to try it on, first.