How much would I expect to have to pay for a early 80's Mk IV Sawback in like new...

[The Mastiff]

condition? I haven't been able to find prices for these in the usual places. No, I'm not selling and I don't have one. I was just looking for a ballpark figure for me to expect to have to pay. What would be a good price? Thanks,

Joe

Edit: I found one with a pretty low serial number but the price seems high. Is that what I should expect?