There's a charger guide listed on fleabay right now for a hundred bucks. It's the only one I've seen for awhile.
I'm in the process of rebuilding a trashed G-prefix Mk I*** and have been able to source all the parts, including a forestock, so they are out there! Keep an eye on the auction sites!
Thanks for the heads up! How can I tell if my bolt face had been modified in any way? I want to make sure if I drop some money on a part, that it will fit.