Trumpets are not a real focus these days. Since much comes from the Dutch and cutflower trade, trumpets I feel are the forgotten wonder. The Lily Garden has the most varieties in the market. Her focus is lilies for the garden.
I can send you some seeds if you want in the fall, if it is something you are interested in trying to grow. They really are easy to grow and flower at a young age. What color are you looking for, might I ask?