Here are the results* from a 100-click solo ad I bought from Ina Mihanovic. You can find more reviews in my solo ad directory.
Clicks bought: 100
Clicks received: 159
Optin percentage: 55%
% Tier 1: 55%
Cost Per Optin: $.34
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.