Well if you can get dark chocolate without any sugars and other bad stuff like 80% or more that only has vanilla, chilies peppers, Stevia, then you can get the full benefits. However eat sparely since it high in calaroesSeems like most chocolate candy has had dark chocolate versions. Reese's and M&M both have ones as well. Something to keep in mind though, most of them have other things which makes any attempt at eating dark chocolate for health reasons null. So eat those for the flavor and not because of supposed health benefits of dark chocolate as those are very likely not prevalent in those (the chocolate itself is processed in a way that removes much of the flavanols of the cacao).
And of course Milky Way, Snickers, 3 Musketeers, Mounds, etc.
I don't think I've yet seen a dark chocolate Butterfinger though I'm almost certain they've made them.