I don't know what I would expect from a Dollar store, certainly my hopes for an excellent dark chocolate bar could not possibly be fulfilled. This bar from the Polish chocolatier Baron contains 70% cacao content, and its ingredient listing is good, cocoa mass, sugar, cocoa powder, soy lecithin and E476 as emulsifiers, and flavouring.
How did it taste? Well, I'm glad I didn't pay more than the dollar I did. Not bad, though a little chalky and ultimately not something I wanted the taste to linger for very long in my mouth. Definitely, not excellent.