BLTAL - Walmart sells some inexpensive rain pants and jackets. They're breathable too. Wader/splash top is a great way to go. Keep in mind that its always best to avoid any and all cotton. A good way to go is a wicking layer like Under Armor or like, followed by fleece, followed by drywear. When sweat is able to sit against your skin, you will quickly start to lose body heat. The wicking layer will keep you dry AND warm.
I'll be in breathable waters and dry top too for the Jamboree. Look forward to seeing you there!