You can find 25-gauge needles at local pharmacies, medical supply stores, and various online retailers. In South Korea, many pharmacies carry these supplies, though availability for specific gauges can vary by location.
If you need needles immediately, these local businesses in and around are your best bet: Pharmacies : where can i buy 25 gauge needles
: Located at 15 Hwanggol-ro, Geumchon-dong. You can find 25-gauge needles at local pharmacies,
: Located at 791-9 Geumchon-dong.
: Located at 50 Jangjisan-ro 368beon-gil. Online Retailers medical supply stores