The Baikal .45-70s are going on gunbroker for around $800. I tried to get one when Remington was importing them in 05-06, but my distributor never got one.... back then it was a $350 wholesale gun... to me it was cheap enough just to go out in the yard and play Africa with. All the thrill... none of the cost so to speak.
Double rifles ain't what one would consider "accurate" by modern rifle standards either. You are talking about accuracy similar to a slug gun.... most of them are going to be regulated at around 50 yards.... in the case of a double gun selling for less than $1,000, it may well not be regulated at all.... they are not simple or cheap to build well. But if you just want something that's different and pretty cool.... I think its money well spent... still cheaper than race cars and women.