Go to flowrestling go to search ''camps'' it will pull up a lot of them
http://www.flowrestling.org/ also
http://www.themat.com/section.php?section_id=12
People or camps I have been to in the past that I would recommend are, Gene Mill's (Great top stuff and fun camp) Burrnett , Jordan, Jimmy Edwards, St. Ed's camps, J Robinson camps and of course Ohio St. Camps.
I think the most important part of picking a camp for your kid is, picking what camp is right for him. For me to help you with that I would need to know your child's age, body type, wrestling style and how long has he been wrestling in that style. Please note I am not talking about freestyle,Greco or folkstyle but your child's particular style of wrestling. How good is your kid, poor, average or elite? last but not least what are his greatest strengths and weaknesses as a wrestler.