This seems like a relative bargain:

Westley Richards Side by Side 577 3" Nitro Express with 24" Ejector Chopper Lump barrels with a 1/4 rib with one fixed standing rear sight, 12 lbs. 15 oz., 15" LOP over a 1" pad, Proved at 14 tons per square inch, The bores are excellent plus plus and remain like the day it was built. It is tight to the face with plenty of bite remaining and built to a proper 577 weight. $36,000.