We only have the £5 delivery option for now. We looked hard at this, and even though there were slightly cheaper options they were not 24 hour services and not tracked.
Customers like to have tracking and often without, shipments go missing.
In fact, the cost of the Royal Mail Tracked 24 service is more than we actually charge. We feel this is good value and the right balance between cheaper services and full courier services. It's also on par with most competitors.