I'm totally looking for a bridesmaid dress, too (except in light green). If you're into vintage/retro fashion, I've fallen
hard for
http://www.modcloth.com an am stalking it practically everyday to see if they get any dresses in that fits my criteria. Most of the dressed are around $40s-80s, some >$100, but really cute stuff IMHO.
Have you tried normal stores like Ann Taylor, Zara, etc? Zara has this floaty asymentrical hem dress in a nice peach that's included in the semi-annual sale that started 6/28. It's probably sold out online, but I saw 2 Mediums in my local store tonight. Good luck!