I'm afraid you will need to all of the above. I'm more of a camp guy than many on this site, but you still need to be on a travel team as well. We mixed both and when my son caught interest from coaches at camps and showcases, they then came to see him pitch in games.
If you're not on a team, then you're expecting to get an offer directly from a camp, and I don't think that happens much unless you're a complete stud.
If you had to give one up due to time or money, I would skip the camps.
Time shouldn't be an issue for your son this summer to get his workouts in, if he wants it bad enough. He or his friends will be driving by then, they can go to the high school every day and work on their skills and conditioning, while you're working on bringing home the bacon.
Good luck!