monstor344 -- You might want to take a look at the Princeton Advanced Baseball Camp that takes place in August at Princeton University. It is a four day camp for a very reasonable cost, lodging in the dorms and meals included. Several Ivies and strong academic D3's attend each year...maybe a dozen schools. There are skill sessions in the morning and games in the afternoon/evenings. It is not the large number of schools you get at some one or two day showcases, but you get a lot of exposure and contact with the coaches that are there, are assigned to one team for the duration, so get to know the guys on your team over the four days.
My son attended a couple of years ago and really enjoyed it and got good exposure. The cost then was about $550...very reasonable for all you get. The link below does not have info on the camp for next summer yet, but if you check later in the winter or spring, it should be updated, or just call to get info for next year.
http://www.princetonsportscamps.com/site3.aspx