Here are the results* from a 100-click solo ad I bought from Nino Sem. You can find more reviews in my solo ad directory.
Clicks bought: 100
Clicks received: 126
Optin percentage: 52%
% Tier 1: 76%
Cost Per Optin: $.53
You can buy a solo ad from Nino at QuickSolos.com
*These are the results from my squeeze page and sales funnel. Your results may vary from mine.