Johnnie, I only have one extra and I dont want to turn it loose.
There are quite a few listed on ebay right now under chainsaw parts, but not real cheap. Just so you know that not all 4400's had 3/8s bar studs but that should be no problem if you find a cover with 5/16" holes. You can just drill them out to 3/8's.
I have seen those on Ebay and I suppose the price isn't to bad since they are NOS, but I am really hoping to get away a little cheaper. I was going to grab one of those NOS chain brake kits until I found a really nice looking bow bar on Ebay the other night, probably over paid for the bow but it is in very good condition but missing one of the chain guards. Suppose I could still use the chain brake cover if I removed the brake parts for now.