I got mine locally here in San Diego for $399...Parkerized, ghost rings, bayo lug, 8+1 capacity, 20" bbl I believe.
Iron Sights shooting in Oceanside. If you can't find it cheaper, I'm sure they will ship you one.
Actually, I have my sights on an SAA revolver...have any to trade? My 590A1 is in good shape and I have both the regular stock and a Compstock for it, along with a nice quiet sling and a soft case. May be willing to trade...
It is a Hogue Poly-Swivel I bought online somewhere...can't remember where, but seems it was only $10 or so. Kind of nice since it's got polymer attachments so it's completely silent - no clanking around.