Recently, I have not seen any stores selling Toyota T-IV
Mobil 3309 was available on the shelf for a few years. But why bother stocking single inferior spec low volume fluid?
Aisin aftermarket has an ATF-0T4, Ravenol has a T-IV, and Idemitsu has ATF-TLS. A version is also available from most dealers since GM, Ford, Volvo, Mazda, Hyundai, Mini, Nissan, VW.... have used AW's requiring 3309.