WANTED: Macbook (that someone wants to retire/replace)

I was wondering if anybody is upgrading their Macbook to a newer version and wanted to sell one quickly (and hopefully cheaply :-) ) over SUPost to a fellow student.

I'm a stats student who wants to dabble in the the MacOS environment and would really love to own a Macbook Pro/Air of some flavor just to get a better understanding of its sensibilities, design, and overall usability paradigm. This is for better or for worse a personal interest, so no grant money for fancy computers just yet. I'll give it lots of love and a second life!

Let me know!