Here are the results* from a 500-click solo ad I bought from Ina Mihanovic. You can find more reviews in my solo ad directory.
Clicks bought: 500
Clicks received: 563
Optins: 252
Optin percentage: 45%
% Tier 1: 81%
Sales: 1
Cost Per Optin: $.49
You can buy a solo ad from Ina Mihanovic at her website
*These are the results from my squeeze page and sales funnel. Your results may vary from mine.