I know there is not a way to currently put Sanrio items on the market. I was really lucky and able to get amiibos from Target. If anyone wants Sanrio stuff but doesn't want to break the bank there are a few items I am willing to trade any Sanrio item for such as:
Black Simple Panel
Silver Simple Panel
Imperial Tile
Lucky Cat Black
Lucky Cat White
Motherly Statue (Genuine)
[Valiant Statue (Genuine)]
Wild Painting Left Half (Genuine)
Cloud Flooring
Nook Items in different colors
Just let me know and we can set up a trade. :)