Thanks for the report, Masamune! The Potion, Weapon and Armor Merchants on Ximending Street had empty shelves and weren't open for business - clicking them did nothing at all. They've now stocked up with the same goods the merchants of Singapore's CBD carry, so potions, throwing stars and arrows, weapons and armour can all be bought right there in Ximending. Live now: talk to each of the three merchants in Ximending and the shop window should open.