You need to go to the information kiosh
There is usually a stand at the center intersection of the mall that sells all of the gift certificates.
I haven't seen gift certificates in forever. Gift cards are the norm now. I think only like massage and spa places do those. Like others before me stated, try the customer service kiosk in front of my froyo.
Online or most stores and the mall desk
There is a mall kiosk that sells them
Probably at each store
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