Thousand of real fine foods and sweets are over there, and you can buy them for a souvenir.
It is different from the general souvenir shops in the airport.
Takashimaya Depertment Store Open hour 10-20 everyday
(It is on the way to Kansai Airport ! if you take Nankai Line. Duty free information is in the Link)
Go B1 floor ! Just lookiing is also fine.
By the way, Meaning of "Depa"is Department, "Chika"is Underground.