The pistol isn't for sale, but the grips are around $11 on the Tractiongrips site. You can probably find the pistols for around $550-600, if anyone has them in stock. They seem to be selling as fast as dealers get them.
It does feel like a slightly plump version of the P938. Measuring them both, there isn't much of a difference. They look fatter than they actually measure with no screw-on grip panels. I think the actual difference it about 1/16 of an inch overall at the widest point.
I just got my hands on a S&W CSX and was able to takeout out on our range for some firing. There were some thing I liked about it, and some things that I didn't. I actually ordered the pistol to design a grip tape for my business, Tractiongrips. It was immediately clear that this pistol needs...
Textured rubber grip tape overlay for the Shockwave grip (made right here in Georgia):
http://www.ebay.com/itm/Tractiongrips-rubber-grip-tape-fits-Shockwave-Raptor-Mossberg-500-pistol-grips-/322761019404?hash=item4b260e500c:g:FO0AAOSwQNRZwUlr
Or, get them from Tractiongrips directly, and use...
I carry my 43 just about every day. I also use the Taran +1 extension on mine, and have been enjoying the holster I got from Cook's Holsters in Bethlehem. I think my Glock 19 is jealous of the 43. Since I bought the 43, the 19 has been spending a lot of time in the safe.