Try Ebay for a Kershaw Blade Trader. I have the Alaskan. It comes with 3 interchangable blades. I have a saw Blade, skinner with gut hook and a regular knife blade. It comes in a leather belt sheath. $35 to $45 bucks.
Theres alway some there. http://cgi.ebay.com/ws/eBayISAPI.dll...150132846&rd=1