int quantity = player.isSneaking() ? scs.getSneakAmount(player) : 1;
// buy / sell / exchange
if (shop instanceof BuyShop) {
event = new ShowCasePlayerSellEvent(player, (BuyShop)shop, quantity);
} else if (shop instanceof SellShop) {
event = new ShowCasePlayerBuyEvent(player, (SellShop)shop, quantity);
} else if (shop instanceof ExchangeShop) {