Answer: Unfortunately, I am not familiar with a plant that is just like a trumpet vine but specifically in bush form. It is possible to train the vine so that it grows in a somewhat bush like shape simply by trimming it back hard to the ground every winter. This will force multiple stems to grow up from the ground and will keep them short. It can also be trained to a single stake or post and trimmed "umbrella" style and will look more like a shrub that way.
Is it possible that the plant you saw advertised was a weigela? This is a shrub and has trumpet shaped blossoms but they are smaller than those on the trumpet vine. They also tend to be in the red and pink color range rather than orange.
Burpee often offers at least one of these plants in the spring catalog. The toll free number is 1-800-888-1447.
Wayside Gardens often offers varieties of both trumpet vine and weigela. Perhaps one of them will be what you are looking for. Their web site is at http://www.waysidegardens.com/ or their toll free number is 1-800-845-1124.
The search function will be more specific if you add additional terms or use the Latin name, and we are working on make it easier to use. I'm sorry you wasted so much time looking at what turned out to be unhelpful results.
I'm sorry I can't be more specifically helpful about the bush. Sometimes the Sunday supplements include offers some unusual plants such as three varieties of Rose of Sharon grafted on one stem, and so on. Perhaps it was something uniquely created for a special order, perhaps by grafting, and did not turn out to be a viable plant in the long term and thus never became widely distributed. I'm sure it would have become popular if it performed well in the garden.
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