My daughter did BBB when we were there in January and they hooked me for the whole tab - dress, shoes, tiara(s), wand, hair extensions, etc. But totally worth it for the joy in her face! Anywho.... Later in the week we were at one of the outlet malls and the Disney outlet store there had last years dresses for $20. Now, being the dumb dad that I am, I couldn't tell the difference. My 7 y/o DD says hers is MUCH better, but.....
In any event, if you have time, the outlet mall across from DTD has a fantastic outlet store that had dresses.