Damn you beat me to the point on CDNN and Sarco. If you're near a Walmart or Books A Million just pick up a Shotgun News. You'll find plenty of options in there.You can get them @ Sportsmanguide.com or CDNNsports.com for around 18-20 dollars ea.
Try http://www.e-sarcoinc.com/carbine.aspx for your carbine part.