Cheapest light and sound board?

I am looking to build small LEDs and a speaker into a prop. It needs to play one sound from USB from a push button, and the lights turn on when the button is pushed.

 

I haven't looked but I'm pretty sure you will need custom build something.

 

Check out the lightsaber sound boards like the Nano Biscottee from Pelcore labs.
they run a LED and sound and most are loaded with SD cards.

You may need to get creative with the sound font but it would be a place to start.