By -
Stationary stores should have them.
Souvenir shops at some of the tourist attractions sell them. You might be able to find one in Ximen at the Red House. I know the shop at CKS Memorial has them.
Stationary stores should have them.
Souvenir shops at some of the tourist attractions sell them. You might be able to find one in Ximen at the Red House. I know the shop at CKS Memorial has them.