I went into the Corby outlet and saw a stack of these. I love the design (steampunk) and the charm feature. Seems to be discontinued at Argos, but the Dauntless pistol and the full bow are still current.

The Nerf Rebelle Charmed Fair Fortune Crossbow combines the functionality of a crossbow with the cylinder of a revolver. This means you can shoot 6 darts before reloading without the use of air pressure or flywheel mechanisms - the darts are propelled directly by the bow string. The Fair Fortune Crossbow also kicks off the Rebelle Sub-Series "Charmed" featuring bracelets and a number of collectable charms similar to the popular Pandora charms. You can either wear the bracelet on your wrist or fix it to your blaster where it will compliment the steampunky awesomeness that the Fair Fortune's design is. The crossbow is cocked using the slide on top of the blaster.

Amazon have it listed at £12.91.