While I am a firm believer that showcases work (can't give my opinion on the camps) there is one point that you must consider more important than anything else. While the player gets to show off his tools at these events, playing in an actual game, with a team he plays with on a day to day basis where there is competition is really what coaches like to see. Example, pitcher facing a hitter who is a top prospect or vice versa. I believe keying in on team tournaments like Wood Bat, etc, is more important. If a particular coach is really interested in the player, he will make it his business to see him if he has not seen him play,before he considers recruiting him. This is just my opinion.
If funds are limited, I suggest you consider this option above all else.Is it possible to play on a summer travel team? If funds are no problem, the sky is the limit, attend as many as you want and your son can handle. We can all give you different opinions, but you and your son have to choose the path that is best for him and your pocketbook. Also, know that your son may want to attend a particular school, it may not work out in the end, so you might not want to put all of your eggs in one basket.