What are some affordable white flowers?

For our outdoor wedding, my main need for flowers will be to decorate the reception tables. I don’t think I will be having floral arrangements/ centerpieces. Instead, my flowers will either be floating in bowls, in small arrangements or sitting on the tables. I wanted to use magnolias, but can’t get them in season in September and they are way to expensive. Any ideas for affordable flowers in white/off-white? Thank you!

Carnation were cheaper for me. I also like daisies.
You can also dye them by putting food dye in the water.

FLOWER PARADE @ MAGNOLIA GARDEN CENTER – AT THE OPENING – 8 SEPTEMBER 2007 www.magnolia.ro