Here are the results* from a 100-click solo ad I bought from Diego Martin. You can find more reviews in my solo ad directory.
Clicks bought: 100
Clicks received: 91
Optin percentage: 62%
% Tier 1: 80%
Cost Per Optin: $.63
You can buy a solo ad from Diego at his website Marketing With Diego.
*These are the results from my squeeze page and sales funnel. Your results may vary from mine.