Derringers are thing of the past. Their time was in the old west. Why have a 2 shot derringer when you can have a 7 shot .32 like the kel tec P-32?
Or a small .380 like the Ruger LCP? Stick with the newer technology and get a small .32 or .380 they are much better than any derringer.
I have the bond arms snake slayer .45lc/ .410... Its slayed 2 rattle snakes while hunting and on occasion I've used it for ccw...its on the heavy side, and the trigger pull takes some getting used to... I like it, its well built and reliable...kind of a high price tag between 4-500