Hm, that's a tough one. I'd suggest prizes, for doing well at the activities, like stickers or candies. Or you could buy a 'well done/thank you for coming to camp' gift for the end, like plastic paperclips, erasers, or some other stationary type stuff. We gave out some Ryan the Lion pens, English notebooks and paper organisers at the end of my last camp, and the students seemed pretty psyched about getting a gift. I don't know where my co bought them or how much it was, though-- sorry!!
