Looking for Brugmansia seeds!
Brugs are usually started from cuttings and there are usually quite a few members here offering cuttings from time to time. What part of the Country are you in?
If you go to the American Brugmansia & Datura Society (ABADS) website you can purchase seeds from their seed bank. The fee in nominal and basically all you are paying for is the shipping. As these seeds come from hybridizers they ask that you continue to grow the plants for a while and report back as to how the plants are doing. They are a wonderful group of people with tons of information and laughs to share.
Here is a link that might be useful: ABADS seed bank