Check early check often.
I am at a computer most of the day. I refresh CL often. Two weeks ago I bought a Schwinn 564 for $30.... dirty, but overall nice shape. The guy said I was the first of 40 emails.
I spent about hours cleaning, lubing, adjusting, etc. I sold it for $175 (although I got offers of $200 as well... but this was a young guy at the college we work at).