Thank you for your query.
Most MBA schools would waive their requirement for formal education, considering the length and quality of your work experience. Frankly, if they don't, they have too rigid admission policies and you may safely ignore them.
'Affordable' is very subjective term, but all distance learning courses have far lower fees compared to full-time courses. If you are considering global MBA, all top ranked schools such as Carnegie Mellon, MIT, University of Phoenix offer these. In India, you can consider ICFAI, Narsee Monjee, www.scdl.net
, Amity, IMT Ghaziabad.
Feel free to ask for more clarification should you need any.