I think it is about $100-200 high and there are lots and lots of model 28s' out there....that being said, it isn't a crazy $1000 asking price and $600 is not the new $1000 dollars....we need to be a little more frugal and look around because like I said, there are a lot of Highway Patrol revolvers out there....I own 2 myself, one in each bbl length last one a 6" in pristine condition no accessories for a hair over $600 in Tx last year at a Cabelas. All this being said, if you actually just can't wait a bit, $875 isn't so much that it will bankrupt you. I have been excited about a lot of s&w revolvers(every one of them) and I have only paid top dollar once....it is an early 6" model 686 anib unstamped "m" and I paid about $850 for it and I have seen many priced a little less without box and accessories which mine has, and I also have 2 same L frames in 4", one is a 586, and another 686...those two I paid closer to the $600 mark, both also anib...and I have seen all three models also priced at &1k but I know the truth is that if I surf the shows and stores, I will find them for less again.....just recently, I passed on a 3" model 36 about 1980 or slightly newer-in fantastic condition here in Southern California at a busy gun shop....$500 and it was there at least 1 week....but I have one a little older with a pinned bbl that I don't shoot and thought it best to let someone else who would jump at the chance to go for it and I suspect they have...I almost bought it on rule of thumb cost point though resisted lol....
All this babble by me and my point is, be patient and you will save a little, but, you won't be getting stung much if you pay that premium.