As long as they are "opt-in" and specifically noted that the e-mails may be sold then it is alright. I have a list right now actually. Let me know what "genre" of websites you were looking for (as I have them categorized). I have a list of 38 million (yes, million) e-mail addresses that I've purchased from a ton of websites (proven to be opt-in when I bought the lists) and it cost me around $1500 total for the list. It's brought me quite a bit of success, but that was about 3 years ago. So, I can't guarantee anything.