You probably won't find anyplace cheaper than retail for Le Mer products, they don't seem to wholesale their products to many retailers. I found this site with a little searching but its not much cheaper but cheaper none the less.La Mer Skincare sales at Cosmetic America. Free Shipping.
Amazon.com as well depending on the Le Mer product you are looking for.
Le Mer products are worth the price, my gf won't stop talking about them. GL