Cheap Party Dresses

Where in the UK can I get a unique but nice and cheap party dress?

I need a new dress but I don't like any that are in the main high street shops at the moment!

Public Comments

1. Try charity shops, and adapt something you like to make it unique?
2. second hand stores, but i guess that goes for every country..
3. Unique?! Omg
4. http://www.imaginarycreatures.net/boutique.htm Lots to chose from, shipping is fast & cheap too