I got plenty of brass from Midway... properly headstamped, etc. As a matter of fact, they have a couple of boxes available now:

.475 brass

My Coggie (albeit a box lock) in the same caliber is now for sale for $9.5K with 80 rounds, 250 bullets, dies, makes case, etc., btw.

As to the question asked... I'd think it is overpriced by a bunch. Mac's estimate may even be generous.. not because of the quality of the gun, but just the fact that C&H rifles sell for less than most all English guns.