Such a long article but no mention of how much he sold it for.
See http://feinternational.com/buy-a-website/3745-software-busin....
He does also mention how one seller tried to demand a 40% discount at close, and that the broker had a better deal waiting in the wings. So we can have a pretty high degree of certainty that the sale price was between $28,500 and $57,000, likely closer to $57k.