The $5000 in Whitehorse for the Merkel double 9.3x74R does seem like an incredible price and it's at least $2000 less than I had expected. They quoted this to a friend that is looking for one, I am not in 9.3x74R. I hope he has a written quote, they are still saying they can do this price. It is the Model 410 with the European stock with great drop, too much for my taste.
I have looked around a lot for a .470 or .500 and there are some good deals out there for a couple of thousand more. As mentioned, it's the price of a quad or boat. I have so many rifles that selling off 20 to fund this just wouldn't matter, to me it would be worthwhile. Buying the Kokiak for $4000 the last time and being completely disapointed was a very good lesson. I will wait until I can afford what I want until I buy another. The price of ammo is not an issue, I will not ever be putting factory ammo in one. I have owned a number of .500 NE guns and a .577 NE and .600, I am used to finding this brass and making this ammo. The .470 brass is available and easy to access and form, it's no problem compared to the other big NE ammo. The .500 NE uses the same brass as the .470 NE necked up, most handloaders on here would know how straightforward this is.
P.S. These are SXS double rifles we are talking about, there are a few O/U double rifles that sell for less money than the SxS guns. I don't know much about the quality of these new O/U double rifles.