Insa-dong's main shopping street has everything you could want for souvenirs, many of good quality. Stop in Ssamzie-gil 4-story shopping plaza just off to the side while here. It's a ramped walk up in a spiral with shops off to the sides. There are info booths at both ends of the main street, closed to cars on weekends, so you can get information as needed. Lots of alleys to explore so plan for some time here.