@Susurrus, If you ever find yourself at the Seed and Stem in Worcestor, MA- that’s where I bought the Oxalis I gave as a gift to my mother! There are several garden centers on the Cape that may have them, although maybe not at this time of year (spring tends to be the big season for the garden centers). But keep an eye out! I hope that you and @Katt and @christine4 are able to find it somewhere- it is a fun and hardy plant that catches people’s eyes! 
Good luck! 
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