www.gunbroker.com
www.brownells.com
www.midwayusa.com
www.Natchezss.com
or you could try eBay. I picked up a barrel and clip for an old stevens 20 ga. bolt action shotgun model 58 . on eBay for a lot less than what it would cost anywhere else.
if it is too much work for you and don't want to keep it post some pics and I might be interested in buying it from you if the price is right.