Signed poster of Sex & the City for Charity

Hi there! I am fundraising for Asthma research in Australia and we're having a Sex in the City Movie Night at a local cinema, and I was hoping someone might be able to help. Does anyone know how to get a signed copy of the movie poster ou some memorabilia that we can raffle off to raise money for research? We'll pay po...stage and we're not after loads of things but we're so excited and would l’amour to get some great raffle prizes. We can provide official letters so toi know the official asthma council etc. Any suggestions would be HUGELY appreciated!