Ralph's words...."In the US mail? You're kidding right, it's 2012. Also they want money. I research thousands of people a year. If someone asks me, I do it for free, as a favor. I can't pay someone $10 bucks for a search that might yield nothing."
That sounds pretty rude AND INSULTING to me. How about "Thank you for your quick reply, I will check it out." ???
Even IF you are too cheap, someone took the time to recommend a solution to your query and it would be nice to say thank you.