Lowest cost online MBA's (USA or Abroad)

[Zardoz]

Manipal University Jaipur, India ($412 per semester, $1647 for full MBA):
www.onlinemanipal.com

MUJ looks good, but as always, there is a catch.

Holders of degrees awarded by non-Indian universities will need to submit an Equivalence Certificate obtained from the AIU (Association of Indian Universities). 

And this will only work for B&M degrees.... since the AIU states in its info brochure:

DEGREES AWARDED BY THE FOREIGN UNIVERSITIES FOR STUDIES UNDERTAKEN THROUGH OPEN/DISTANCE/CORRESPONDENCE / ONLINE/VIRTUAL MODE etc: 61. As of now, the AIU does NOT accord Equivalence to such foreign degrees that have been obtained for studies undertaken through open/distance/correspondence/online/virtual modes(s) etc ;

So unfortunately, until the AIU changes its policy, people with online bachelors degrees are SOL.

Of course, the only way to know for sure with these kinds of things is to actually submit a Big Three or UMPI degree for evaluation and see what they come back with.