American voice for animated character

I require a voice over with a North American accent to voice the part of a young boy (pre-school). The boy is very wise beyond his years. He is the main character in a series of animations that will be uploaded to youtube. Each episode in the series, the character may have up to 2000 words, however, the script is not finished, so it will very likely be less. There will be no voice sync required, as the animation will be worked around the voices. This is a very low budget project initially, as we want to test the animation first. If it proves successful, we will likely raise the budget. The work will start as soon as the script and story board is finished, so probably around early February. Please quote for one episode and also state how much you would require for 5 episodes of the same length. Please send a demo in the voice of a young child.