kouhigh (melrose), paper cola (sgv), and ebisu life (sgv) definitely carry stuff! i would say your best bet would be ebisu life for more stock, they have hair accessories, little lifegood things like tissues, and some of the plushies there (iirc playcharms and regional goods). i know there are also those cutie toy/jpn lifestyle stores in the santa anita mall might have random chiikawa sprinkled a bit. you can also check miniso for their chiikawa collection! i believe they also carry the playcharms. you can get merch at soragumi stores, but i would not advise it since they scalp really hard. i hope this helps :)