Why not just submit your site? You can get more links in less time for little money that way. Besides, if you just buy the domain, you may lose the PR very quickly as the content of the site changes, unless you purchase the entire site.
I have a couple that I may want to sell, but they would not be cheap, of course.
7500Books.com
4-mesothelioma-info.com
Perhaps you just want to buy some links for a while...?