I've never done this, but I think it is a great idea- go for it!
Susan

I have two realtors that buy regularly for open houses. They also buy bouquets as "thank you" gifts. It works great for me -- but it is a place that you may want a supply of cheap vases available. I arrange them in loose "country" style mixed bouquets.

Be sure to tie your card directly to the bouquet. Sometimes, the realtors have so much on their mind, they may not put your card with the flowers. And this has helped promote my business.