To start I would like to state that this is my first Arduino project. My plan is to use the Arduino for a Halloween decoration that when a button is unpressed will play a sound that will fade in and out repeatedly, along with shine to LEDs. Then when the button is pressed the LEDs shut off and a different sound plays once. Is this possible and if so how and at what price.
To play sounds you will probably find that an MP3 or WAV Shield is easiest to work with. Just use Google to locate one and get a price.