There are some universities like Jhonson& Whales in Rhode Island and University of Findlay in Ohio where you can directly apply for MBA. You don't have to take pre-MBA course in these universities.

However, I just want to make you aware you about some facts:
It's hard to get on-campus or off-campus jobs in those universities.
Unless you've some IT knowledge & experience, it is really hard to land a job with just an MBA degree here in US.  (Nepal ma maatrai ho MBA ma kaam paauna sajilo)


I'm not trying to discourage you by any means. So, just do your own research before taking any step.