I came across this listing.....

Started listing price $7500, 4000 visitors a month, net profit $52 a month...

http://flippingethics.com/2010/08-23/stockfuel-com-being-sold-by-jaybirch-on-flippa.html

YMMV

It's not a bad site. It looks like a genuine listing ... not likely to be a good investment, though, unless you are a marketing whizz who just wants a ready-made site with a bit of content.