Here's the thing, we don't have ALOT we can trade with them.
We do have one BIG THING. We have thaumavore rats, mana-eating rats. That can knock out drow who are eaten at by them. This is a serious weapon, and a trade resource.
The Dwarves would not be effected by them. If we could sell them manaplant seeds (if those suckers will grow outside) and the mana-rats, they'd be able to weaponize them, use them against the drow, retake their old homelands. We would earn their alliance PERMANENTLY. We might even be able to trade it for their blackpowder. "Hey guys. Look, we are giving you the thing that could turn the tide of the war. In return, we want the blackpowder recipe."
Earth,fire,wind,and water all come together in perfect balance inside of a Smith's forge, this perfect harmony of elements can rarely be found anywhere else in existence.