The only place I know of that sells them is Blade-Tech (http://www.blade-tech.com/). They run around $8 plain or $9 with the screws for attaching them. I think you'll have to call in the order, since I haven't seen them on the web site yet.
I bought one for my ArcLite, although I still carry it more often as a neck knife. I love the versatility!
--Bob Q