Briley and Galazan are the two most expensive outfits in NA (well short of Turnbull but he's not really a double gun guy).
The price I quoted was from Keith Kearcher's website, and doesn't include reblueing/browning. With those in addition (if you want Keith to polish the bbls rather than doing it yourself), you are looking at "Strip and relay ribs with reblue or brown $500.00 - $600.00" and that's for both ribs. KK is considered the go-to double gunsmith in the NW.
However, don't let me stop anyone from specifying and paying for the full monte!