It is much cheaper to order flowers that are in season. There are some beautiful choices for winter and it's in the holiday colors.
The flowers in season for winter weddings are: Amaryllis, Anemone, Camellias, Casablanca Lilies, Forget-me-nots, French Tulips, Gardenias, Holly, Jasmine, Orchids, Mini Gerberas, Paperwhites (Narcissus), Poinsettias, and Roses.
Fillers are also in season all year long - they are beautiful and much cheaper than florals. They come in a variety of colors.