Who sells em? And how much are they?
Art made the one on his 40x about the time you were born. I don't think he has a spare lying around though! Regards, Bill
Davidson was the de facto standard. No longer available, neither is Speedy's.
Give this guy a try http://www.jj-industries.com/ he was making sleeves a couple of years ago.
Your best bet is to put a wtb post on BR.com somebody is bound to have an unused one sitting around. I would count on about $150 and up depending on who made it and how much machining went into the final product.
About all a sleeve will do for you is provide a large bedding area in case you want to hang an extra large barrel on your action. It won't do much accurracy wise. regards Randy
He does muzzle brakes for $35, barrel blocks are a bit more.