Many colleges offer buisness minors (RIT for instance:
http://www.cob.rit.edu/current/under...te/minors.html).
If you want two full degrees, you're going to need to do the work associated with both. It usually takes a year or two extra. Some degree programs make exceptions by double counting some required courses. For instance operations research is both a requirement for my major and a requirment for the MBA program at my school. If I wished to earn both a BS and MBA, I could double count this course effectivly saving 4 credit hours (silly quarter system).
I think most schools allow you to double major, but it is more work and will take more time.
Greg