Do you want to try love flowers? They can give you a detailed quote. And they heaps of flowers, sizes and shapes to choose from. If there isn't something on their site, Miranda would be more willing to give some advise so come in under budget.
I got my flowers from there and they were really good. You could also give ebay a try? There are some brides on there that are now selling there wedding flowers, a good buy if you don't mind second hand. http://www.loveflowers.com.au