Buying A Maggie Sottero Dion Gown Online

Hi,
I am interested in buying the Dion from the Maggie Sottero collection. Can you recommend a reputable online store? I wouldn`t mind buying a preloved one either. The Maggie Sottero website does not recommend you buy over the internet, but of course money I save buying it online could go to a lot of other uses. If you have bought your wedding gown online I would love to hear from you.

Thanks,
Rachel
(Australia)