Wanted: Hiccup Horrendous Haddock Audio Books

We love listening to Cressida Cowell's 'How to Train Your Dragon' series as audio books.

Is there any chance any one can lend us or sell us second hand copies of a couple of the instalments we do not have, including;

• A Hero's Guide to Deadly Dragons
• How to Ride a Dragon's Storm (I have this somewhere but cannot put my hands on it...)
• How to Seize a Dragon's Jewel