I don't do a huge amount of shopping on line but there are a few places that i visit regularly;
Haus of Gloi - natural and handmade skincare; scrubs, soaps, perfumes, butterbombs and lip balms. I particularly enjoy the soaps and their seasonal releases, especially Halloween.
Strawberry Net - free shipping, somewhat discounted beauty and skin products. This is where i usually get my Korres products from.
iHerb - lots of discounts available (my discount code is KRN216) great for natural and eco friendly things, probably the best place for buying ecotools or real techniques brushes as they are much cheaper then in Priceline.
BeautyBay - Free Shipping & sellls Urban Decay produts (including the Naked pallets)
Crush Cosmetics - International Brand shipping worldwide, includes NYX, ELF, NFU and China Glaze.
HQHair.com - British website with free shipping on NARS!
bhcosmetics - Very cool eyeshadows which frequently have discounts.
Favorite Etsy Shops:
Treasures Fo A Queen - Previously reviewed here, this is a awesome jewelery shop based on medieval specifically Tudor and Elizabethan style, very affordable, great service and lovely pieces to highlight any collection.
ChiChiDee - Headbands and Head wraps, Collars, and Bags really pretty pieces and super fast shipping.
HelloZee - Lovely and super colorful bracelets and jewelry pieces, super pretty!
MaAndPaPeddle - Gloves and hand wraps, as someone who easily gets cold these are a god send.
MiracleShine - Kick-ass scarves!
Note: Almost all these etsy shops are happy to do custom orders if you have something specific in mind :)