Here are 2 Ninja on finding untapped and undiluted email list for solo ads
When you go to google.com simply search for:
“your keyword” + aweber.com
The results will show up on will a list of people who are talking about your keyword plus collecting emails. SO if you are a marketing weight product you would type in:
“weight loss advice” + aweber.com
You could then contact the people who have an email list in that niche your are in.
You don't have to only use aweber your could use any emailing software like:
getresponse
icontact
mailchimp
Ninja trick number two for finding untapped, unused and undiluted solo ads
Go to youtube and do the exact same thing minus the aweber or email marketing software.
Find people that are talking about it and contact via google+ or emailing them.
These people are just like you. Looking to make money.