Alter Eco is one of several "fair trade" chocolate brands. They put a lot of effort into reforestation and sustainable packaging. You can find some of their products in stores, but if you want access to their entire selection, or bulk quantities, ordering online is the way to go. Their milk chocolate bars are especially rare in brick-and-mortar distribution.
Their Nut Butter Bombs very much taste like Reese's Peanut Butter Cups, just with almond or hazelnut filling and a little more posh. They and the truffles are wrapped in compostable wrappers. The Truffle Thins are good too, with a similar "like an Andes bar, but classier" vibe.