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Dunno about SA, but I would check some of the bakeries in Houston's Chinatown near Bellaire. Also, there's a Korean Bakery named Teh Guk Dang on Royal lane in Dallas that has red and green bean mochi, though I'm unsure if they actually make the dough themselves. I hope this helps.
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Te Guk Dang
2546 Royal Ln
Dallas, TX 75229
Neighborhood: North Dallas
