Those prices sound WAY high to me based on what I've seen locally and what EMF does or at least did sell them for not so long ago. I decided to take a new look at what EMF is listing for these days and they are up quite a lot. I got mine from them for $300 back when I decided I wanted to try CAS. They shipped me both the rifle and a pair of handguns and I bought all three from them.
Now they list the rifles from $469.90 for the Hartford 1892 Lever Action Carbine, Blued Frame, 20" Round Blued Barrel, .45LC all the way up to $594.90 for the Hartford 1892 Lever Action Rifle, Stainless Steel Frame and Barrel, 24" Octagonal Barrel, .45LC.
EMF doesn't import the .454 Casull version that LSI does and I suspect it's gonna cost more for no good reason other than they figure folks will pay more with the MAGNUM title attached. I'm sure it costs them no more to make one chambered to .454 Casull than .45 Colt.
I've seen folks trying to get $450 for used ones lately but haven't noticed too many takers at those prices. Since that's right up there where new ones are selling for a used one likely should be a fair bit less. Based on EMF's asking prices I think Bass Pro is a bit high on them but not as much so as I'd have thought prior to looking up current pricing.