Nampo-dong has Daiso Busan Nampo (46 Gudeok-ro) and Gukje Market Store (13

Junggu-ro), both open until 10 pm, right after BIFF Square and the market. For a bigger bottle, Stain Zero 100ml is ₩2,000 with 18K+ orders and fits your 1L carry-on bag; the two 30ml ones are lighter. Keep the portable 10-pack in your bag.