My first reaction was: Gosh! I could've written that post myself. The exact same thing happened to me last fall. I spied the Diane von Furstenberg "Jeanne" wrapdress Elle McPherson is wearing below in an ad in American Vogue:
(Photo by OutfitID)
When I saw the ad, I immediately went to the DVF online shop to look for it. Yes, there it was in all it's glory - at a total cost (including shipping and import duty) of NOK 3600 (USD 600). Now, if I had been working, I probably would've gotten it anyway. However, being a student at the UIO I really don't use much designer clothes when attending lectures or studying at the library, so I found the price a bit too stiff for a garment I wouldn't be using that often.
But I bided my time and just after Christmas, during the January sales, I turned to my old friend Ebay to look for it. BINGO! A highend designer seller with a 100% feedback record had it in my size for half price - new with tag!
Btw, have I mentioned I love Ebay? ;)