They need to be fitted to your eye; however, if you already wear contacts they can be ordered online or through your doctor. You don't need a prescription/correction to get the Colours, but you need an eye exam.
I've seen a lot of lenses that are "costume" but I'd never put those in my eye. Your vision is serious business and I wouldn't screw it up just for the sake of saving a few bucks on contact lenses.
Attention: NOTHING on this site may be reproduced in any fashion whatsoever without explicit consent (in writing) of the owner of said material, unless otherwise stated on the page where the content originated. Search engines are free to index and cache our content. Users who post their account names or personal information in their questions have no expectation of privacy beyond that point for anything they disclose. Questions are otherwise considered anonymous to the general public.