Yea I never find any good deals on anything around here. I've never seen a new edge Cobra for 5k or less, maybe a roller that needs an engine and trans. You maybe could find a ragged out sn95 around that, most of those start around 7k. I have seen srt4s in that range, and for the money and fun factor I'd definitely have those at the top of the list.
Sometimes living in a snow area has an advantage. This time of year there are deals out there.
Just a quick search:
http://cosprings.craigslist.org/cto/5379901430.html
http://denver.craigslist.org/cto/5415386858.html
http://fortcollins.craigslist.org/cto/5359117841.html
http://cosprings.craigslist.org/cto/5410175345.html
https://cosprings.craigslist.org/cto/5417813096.html