I wouldn't say fair, more like almost good on his prices. I wouldn't have gone over $25 for that coin, at $25 that would have been close to $2.50 over current melt value.
If you like it and are happy with the price, that's what matters. What's a couple bucks when you have a big hunk of history & silver in your pocket??? I've carried my 1882 O Morgan everyday for the last four years. I feel naked without it! Does the 1891 S have any significance? Mine's 100 years older than I am.