This also a discussion that has been taking place for long time. How much to spend on wedding flowers.
There are authors that give it a percentage of the total amount to be spent on the wedding it varies from 10-30% depending on what king of wedding flowers and arrangements, centerpieces are going to be decorating the wedding.
Also it depends on what part of the country the wedding is going to be held. If doing yourself flowers is and alternative there are places online to order fresh cut wholesale flowers and the prices are the same nationwide.