Here are the current prices at the shop as of the 4/3/2018. The shop does not repair iron/gold tools or armour at all. For armour diamond uses diamonds, leather uses leather and chain mail uses iron. For helmets it take 4 items, for chest plates it takes 6 items, for leggings it takes 5 items and boots it takes 3 items. Diamond tools take 2 diamonds for axes and pickaxes and 1 for swords, shovels and hoes. Horse armour can be repaired at 6 items each. And for misc tools, shears takes two iron, fishing rods take 2 string, bows take 3 string, elytra take 3 leather and shields take 2 iron.