What is the best way to find an unlisted number without paying out the butt? (pe

Question:

What is the best way to find an unlisted number without paying out the butt? (perferably free but if not, ok)?

Additional Details

6 months ago
Look, I hate smartasses. Just because that one guy had to be slick...I am looking for my dad who i haven't seen in god knows how long. If your gonna slam someone, do it SOMEWHERE ELSE!!!!
I am looking for answers to find family, not ignorant answers, so please don't waste my time!
To all the serious answers, Thank You, it is appreciated!

Best Answer - Chosen by Asker: 6 months ago
Look, I hate smartasses. Just because that one guy had to be slick...I am looking for my dad who i haven't seen in god knows how long. If your gonna slam someone, do it SOMEWHERE ELSE!!!!
I am looking for answers to find family, not ignorant answers, so please don't waste my time!
To all the serious answers, Thank You, it is appreciated!