amazon.com for most everything I needed.

Only the mini amp is from radio shack.

http://www.radioshack.com/product/index.jsp?productId=2062620


I got the rest from amazon.com

Belkin Speaker and Headphone Splitter $3.49
http://www.amazon.com/Belkin-Speaker-and-Headphone-Splitter/dp/B000067RC4

PYLE PSP8 All Weather 5-Inch Trumpet Speaker $9.88 each
http://www.amazon.com/PSP8-Weather-...SP8+All+Weather+5-Inch+Trumpet+Speaker


3.5 mm cable 36 inches long $5.00
http://www.amazon.com/Mediabridge-S...1387933680&sr=1-1&keywords=+3.5+mm+cable