There are some convenience stores on the campus where they sell daily articles such as shampoo, soap, office stationary, laboratory cloths, sport equipment, electric devices, etc.
Open: Mon Fri 9:00 AM~6:00 PM
Hours of operation: Mon~Fri 9:00 AM~7:00 PM, Sat 9:00 AM~2:00 PM, Sun : Closed
There is an optometrist in Tae Wul Gwan (N13) where you can make a pair of glasses and check your eyesight. They operate even during the lunch time. KAIST Brand Shop at Student Center (W2, opposite to the convenient store) is a good place to buy mementoes and souvenirs.