I'm getting proposals back from different florists and I can't believe how expensive mandaps and florals are!

They're all coming in around $8-9k total and that's way more than what we wanted to spend! Is that what I should be expecting to pay for a 200 person wedding?
For the mandap, we want to keep it simple and pretty since we're having an outdoor ceremony in Miami. Even though we thought that making a mandap using mahogany bamboo and a few florals here and there would be pretty inexpensive, the quote from our favorite florist came in at $5k!
For the rest, the quotes do seem in line.. 65 and 95 for low and high centerpieces, 90 bridal bouquet, 55 for garland. What do you think, are these costs reasonable?
I have a call with the florist tomorrow to see if she has any ideas on how we can reduce costs. What did you girls do for your weddings and was there anything specific you did to reduce your floral costs?
Thanks in advance! Any advice and tips are greatly appreciated!