Another great way to save money is to look at flowers that are in bloom year round. Carnations, Fressia, Alstroemeria, and a variety of others are less than $2 a stem.
If you are creative and have help, then consider getting your flowers from alternative places then the usual florist. Warehouses like Costco and Sam's Club have beautiful flowers and you can get them at a discounted price. Another option is checking out your local farmers market. They usually have at least one person selling flowers and a very discounted price. You can talk to them about special orders and then take the flowers and make your own bouquets.