Here are the results* from a 500-click solo ad I bought from Daniel Madeira. You can find more reviews in my solo ad directory.
Clicks bought: 500
Clicks received: 552
Optin percentage: 45%
% Tier 1: 69%
Cost Per Optin: $.48
You can buy a solo ad from Daniel Madeira at his website
*These are the results from my squeeze page and sales funnel. Your results may vary from mine.