Summer dresses

I really, really need a new dress this summer and have been searching high and low. So, I need some input, friends. Where do you shop for the dress (or any outfit, really)? Do you go vintage? If so, where?! I need to find some new spots. 
Also, I have been toying with the idea of making a dress. Any tips?

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This pretty dress from Jigsaw would be perfect. 

But, the  £160+ is a little out of my price range.

p.s. Thanks to Alyssa for numbering me among her top seven blogs. You are so sweet!