What companions have been for sale for Adventurers League players at Fai Chen’s Fantastical Faire?

Fai Chen’s Fantastical Faire is described as a trading opportunity for Adventurers League players. It is also reported that there are opportunities to buy other consumable items but also “companions”:

While he does not sell permanent magic items, he does need to feed his ever expanding family. He makes money by selling consumables and other unique things like property, guild memberships, or a companion from his mini menagerie.

What is the range of companions that have been spotted at Fai Chen’s (i.e. are they all beasts?) and what is their price? Most specifically, does there seem to be a pattern in the costs related to the CR of the companion?