Where can I buy 31 cm rice paper (spring roll wrappers made of rice flour) in Sunnyvale/San Jose, CA area?

I've seen Asian places using Greenland brand 31 cm (12 inch) diameter rice paper to make large spring rolls, but I cannot find any store that sells that brand or any other brand of 31 cm (12 inch) rice paper, neither locally in the Sunnyvale, CA area (I've tried many Asian markets, all of which carry only the 8.5" 22 cm size) or online. Amazon has one selection, but it is a mix of rice flour and tapioca. I prefer rice. Apparently restaurants can get it from a restaurant supply but that isn't retail.