For all those FIREFLY fans out there, I found a website selling actual bobble-head geisha dolls, as mentioned in the episode “Trash”:

INARA: What was the last cargo we snuck past the Alliance to transport?

MAL: We made a perfectly good piece -

INARA: What was the cargo?

MAL: They were dolls!

INARA: They were little geisha dolls with big heads that wobbled!

MAL: People love those!

INARA: And what exactly was our net profit on the famous wobbly-headed doll caper?