Here are the results* from a 300-click solo ad I bought from Chris Watson. You can find more reviews in my solo ad directory.
Clicks bought: 300
Clicks received: 327
Optins: 147
Optin percentage: 45%
% Tier 1: 58%
Sales: 1
Cost Per Optin: $.46
You can buy a solo ad from Chris Watson at his website
*These are the results from my squeeze page and sales funnel. Your results may vary from mine.