I bought mine in 1983 for $450.00 to use as a back-up when I guided Bear hunters in Alaska. It was solely for when we were forced to go into the dense Alder thickets to recover a wounded bear. (I hand loaded 250 gr. RN Barnes bullets. Of course my main rifle was a 375 H&H.)
I haven't priced any since then then but I have heard they go for $1500 (used) and up.