A place for investment shopping, The RealReal is a super-glossy US-based luxury resale site. If you really know your fashion, this is where to find past season hits for half the price. If you have been lusting after something very special for a long time, head here (hello, floral Balenciaga blanket-style bag). The site has a large jewellery offering, which is all authenticated, so this is the place to buy an Hermes bracelet or a Cartier love ring. Not a website for weekly browsing, but an excellent choice for one-off seasonal pieces and annual treats. Bag, $206.50, Danse Lente.