Cheap and easy. Should cost under 10$ minus the dremel tool. I am making a 3 pound whistle rocket tooling, and spindle. 1" in diameter with a 3/8 inch core, 1 1/2 inch long. You can scale up or down to desire.
Whistle rockets as the name describes are rockets which emit a very loud whistling sound as it shoots into the air. It contains a pressed pyrotechnic composition called whistle rocket mix. In comparison, the whistle rocket tube is usually about half the length of a similar diameter black powder rocket. No nozzle material is used in the construction of this rocket and it has a very short core making this device an end burner. When the rocket is lit, the composition around the core burns extremely fast, propelling the rocket into the air very quickly. The rocket then changes characteristics, and the material oscillates and the remaining half of the tube acts as a resonating cavity, essentially amplifying the whistle sound. During this process the burning composition still generates enough thrust to continue propelling the whistling rocket through the sky. (Pyroguide.com)
Here is an example of a whistle rocket with a 2" can shell attached to the top. tt stars on top with gold glitter on bottomhttp://s90.photobucket.com/albums/k243/nateputt21/?action=view¤t=638b25ac.pbr