Are they in an autoresponder (like aWeber) or just a list of emails. If they are just a list, I don't think you will get anything for them, especially such a small number. It is impossible for you to prove where they came from. For all the prospectie buyer knows, you jumped on elance and got someone to troll the internet looking for email addresses at $2 per hour. Would cost about $10.
If they are in a double opt-in auto responder, what do you want for them?