Here are the results* from a 100-click solo ad I bought from Itamar Blumenfeld. You can find more reviews in my solo ad directory.
Clicks bought: 100
Clicks received: 120
Optins: 49
Optin percentage: 41%
% Tier 1: 68%
Sales: 1 ($7)
Cost Per Optin: $.57
You can buy a solo ad from Itamar at his website.
*These are the results from my squeeze page and sales funnel. Your results may vary from mine.