You can get a really low profile steel mount from the factory, but you must drill and tap the barrel shroud. There are very light Weaver style mounts with a flat base that can be mounted by drilling and tapping as well. Someone made a set of rings that clamped directly to the vent rib, with no separate mount. To the best of my recollection, this was a 3 ring system. These ring systems pop up occasionaly, but rarely on the used market. Aimpoint makes a mount that is sort of a compromise. The front on the mount clamps onto the vent rib, while the rear of the mount screws into the sight adjustment hole of the rear sight (of course you have to drift the pin and remove the rear sight. This will give you a sturdy mount that is lighter and also better balanced than the B-Square because it is mounted further back toward your hand. The big disadvantage is that you have to remove the rear sight from the gun to use it and you have to unscrew the back of the scope mount to change barrels. I just bought one of these Aimpoint mounts of ebay for $18.50 including shipping. I see them fairly frequently on ebay.com, gunbroker.com, and/or auctionarms.com. I think there is one up on one of those sites right now for around $12.00, but I can't remember which one.
Those are the main options available for scope mounts on the Dan Wesson.
Roll Tide