Names of skate-wear shops that i can find on the internet?

I am currently carrying out research into skate-wear and its trends but i must admit i am not very clued up on the subject and do not know where to start. If anyone could help by suggesting any shops that sell skater wear such as 'vans' i would be very grateful. Also, seeing as i will be conducting most of the research at home for the moment it would be good if they were fairly popular shops which had websites through which i could view their clothing ranges. Thanks.