Evening Dresses On Sale

Evening Cocktail

Dark blue cocktail dress/evening gown?

My girlfriend has said that she wants a dark blue (navy/midnight blue) cocktail dress or evening gown. Where can I find a nice, classy one to buy for her? She's about a size 4/6, but size isn't that important... I figure that once I buy it and give it to her, we can exchange it or get it tailored as long as it's close. Thanks!
To give you some more idea of what I'm looking for, I was thinking of something that looked like this, but in navy/midnight blue http://www1.macys.com/catalog/product/index.ognc?ID=206953&LinkType=CrossSell&PseudoCat=18110&LinkLoc=18110

the closest one that i found, that came in navy blue was:

http://www1.macys.com/catalog/product/index.ognc?ID=207989&CategoryID=18110&LinkType=EverGreen

but try to look for yourself

http://shop.nordstrom.com/C/6008190/0~2378467~2378483~2377032~6008190?mediumthumbnail=Y&viewAll=1&tuid=00000418-006c-085e-6361-745f6d656469&catID=6008190&Category=6008190

http://www1.macys.com/catalog/index.ognc?CategoryID=18109&LinkType=EverGreen&Size=NOSELECTION&FeaturedBrand=NOSELECTION&PPP=96&PageID=18109*1*96*-1*-1

http://www.rampage.com/page/depts.deptid.16

http://www.groupusa.com/c-prodsub.cfm?gid=2&cid=1

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