for a list that is 10k to 20k in size, email only, most people would give that as a sample in the mailing biz. personally, i wouldnt pay for that, as there is no proof the emails are optin. if you need full data leads for cheap, you can contact me. i do have a rather large database of email only, but you have to be careful when using such emails as its rather difficult to prove to your isp or host that you arent spamming should you receive any complaints.