I don't know if your still reading this Chris but if you are looking for wooden pallets to sink in your pond I have just the thing. I have many (probably 75 ) hardwood (oak/maple) pallets at my business. These are discarded but in good shape. When my pond was being bulit I banded several togther and placed them in the pond bottom with cinder blocks on top. The are hardwood so they should decay slowly. You are welcome to any of these if you could think of a way to sink them. Freeze over in the winter maybe? Let me know.