Books in the Starchasers series

The Starchasers are on a perilous mission to Trajan to rescue Ripp Gunn's daughter, Ella. On Trajan, huge galactic shopping malls cater for the richest people in the galaxy, and everyone else is brainwashed into buying things they can't afford. It's a dangerous place full of shopping addicts and the team suspect that Ella is one of them.