Where can I buy Tennis Racquets with grip sizes other than 4 1/4 (4 1/2) in the Republic of Korea?

I've been living in Korea for quite some time, and found quite a fascinating sections of racquets to choose form, however, rarely see racquets with a grip size other than 4 1/4. What is the likihood of finding a 4 1/2 grip-sized racquet. Is it possible? Please help me!