Cost of Green Design

So, I just checked my email and realized I am the only one not to have posted my ideas yet. I am still putting things together and should have something more substantial to post on Saturday am. I have been gathering resources. There is a lot of cost analysis out there. I am trying to gear it toward residential design and am finding more limited resources but more than enough to write a paper on. My topic seems to be narrowed down to the extra cost of green design (and how it's not always extra). More on this topic shortly...