AnswerProbably not, because the costume shop near me doesn't sell flowers. Flowers are not typically found in halloween stores, but can be found in many stores such as Michaels and Jo-Annes.
AnswerUsually costumes of that nature can be found at any local costume house. The prices im sure vary by the costume, the more intricate the costume, the higher the price.
AnswerBeing something cute for Halloween rather than something scary can be fun. To be a flower for Halloween you could make flowers out of felt and glue them to a dress.