Mama Lu's Dumplings

I would like to purchase the XLB’s in bulk from Mama Lu’s. I originally thought all 3 locations were under the same ownership. Now I am finding out the City of Industry (17515 Colima) and Monterey Park (153 East Garvey) are under the same ownership while the West Garvey location is separately owned.

Which one(s) is owned by Anna Tang and others? Which location sells the XLB in bulk?

I have eaten at all three, they all tasty the same and have the same XLB, at least I cannot detect any difference, FWIW.

I do know the E Garvey location sells like in bulk, and the Rowland Heights location had them about 2 weeks ago, cash only for the dumplings for some reason.