They are hard to find and very expensive when you do find them, unless you just plain luck out. Try hard to get one with the original Leupold rings with it, as good quality 7/8ths inch rings for them are hard to find!! If you have to buy rings separately for it, the Leupold Alaskan rings bring anywhere from 35.00 on up -- sometimes up over $50 on Ebay, etc. so not having them with the scope is a significant detractor and should be calculated into the price when you buy. The scopes are much in demand, though, so if you really want one, don't be too quick to pass one up even if the price seems high.
Like I say, you might have to look for a year or more before you find one.