Hi! well I did a research through all the list of blacksmiths and the armors they sell and the best one they can provide from a regular trading is a plate armor:
(You see a plate armor (Arm:10). It weighs 120.00 oz.)
And if you return Sam's Old and used backpack to Sam, the Blacksmith of Thais, he will provide you with a Dwarven Armor:
(You see a dwarven armor (Arm:10, protection physical +5%). It weighs 130.00 oz.)