no no you’re not bothering me at all (: i guess it really depends what kind of dress you’re looking for, so i’ll give you the links to a few of my favourite sites (:

asos is one of my favourite sites, they have a really great variety of clothes and they’re quite affordable. i get my ball dress from there last year and it was really nice. they also ship anywhere in the world for free so that’s convenient -  http://www.asos.com/au/Women/?xr=1&mk=VOID&r=3 

another good site is modcloth. it can get pretty pricey but they have some amazing dresses on here. a lot of it’s vintage though so i’m not sure if that’s really what you’re after, but i’ll send you the link anyway -  http://www.modcloth.com/shop/newarrivals?mkwid=stuqTmNvU&pcrid=12860401063&gclid=CPupqfaF960CFQlnhwodGk-cuQ

this one doesn’t have a great range but there’s usually a few nice dresses featured - http://www.ae.com/web/browse/category.jsp?catId=cat4010018

lucy in the sky have some reaally really nice dresses. again not sure if they’re what you’re looking for, they’re probably more party dresses than formal dresses, but i think most girls these days are going for that sort of look. also very affordable. - http://www.lucyinthesky.com/

now this site is probably the best to go to for formal/prom/ball dresses. they have an amazing range and every single dress is absolutely beautiful. pretty expensive, but i think you get what you pay for - http://www.simplydresses.com/dresses/dress_by_event/prom

i hope this helps (:
if you need help picking i’m always here c: