There is an assortment of shops provided by PotterPlus by default. Shops in Magic are really just spells and can be attached to NPCs, ran by command blocks, etc.
TIP: You can demo these spells by performing
/cast <spell-key>
shop_spellsshop_spells_requiredshop_ollivandershop_textbooksshop_broomsshop_potionsshop_potions_legendaryshop_potions_ingredientsshop_potions_potionsFor currency the Book Shop, Broom Shop, Potion Shop, and Legendary Potion Shop all use Galleons. To give players galleons, do /mgive <player> galleon [amount].
The shop_potions is now a menu that has two options, ingredients (shop_potions_ingredients) or potions (shop_potions_potions) which cast spells bringing up the respective shop. There is a Legendary Potion Shop (shop_potions_legendary) which sells more powerful potions.