I think you might like Larole. They sell unique style clothing
Have a look at jackielovesvintage.co.uk for some bargain vintage clothes!
Check out modcloth or maybe love culture. Here's some more That's all I can think of right now :)
Definitely check out threadless.com! Almost all the designs are completely original artwork (I'm pretty sure) and the clothes are super inexpensive. I have like two hoodies and five shirts from there haha
Things like eBay and Amazon then you don't have to worry about looking for websites.