CGX is a UK retailer that buys, sells and trades new and pre-owned tech. CGX partnered with Gravytrain to increase the volume of orders coming through its website without letting acquisition costs run away, in a market where long-established competitors keep prices high. Growing volume profitably meant looking for efficiencies at every stage rather than simply spending more: targeting the right price points, making sure the right products appeared in the right campaigns, and expanding only once each part of the account had proven itself.