You know what's funny? Flowers were the thing I expected to give me the worst sticker shock for my wedding, and they ended up being among the cheapest. Now granted, our centerpieces were included in the cost of the reception, our bridal party was not huge, and our tiny church didn't require a ton of flowers, but that rang up at like $500. I was expecting over $1000.
Now the effing photographer, OTOH...those guys know they have you by the balls. I will admit, though, that the one we chose was very good and worth the cost.