I am post graduate (M.Sc)in Biotechnology done in 2004, want to do more study in less fee, pls. guide me.

I am post graduate (M.Sc)in Biotechnology done in 2004, working in marketing field but want to go in R&D my, & want to do more study in less fee, any advance diploma after post graduation is available and can i go in R&D area again, this is my humble request pls. guide me.