Plushy minky is a longer thicker fluffier minky. You can order it as a collar on its own on this page
or add as a lining to another material. 

To order as a lining on another material choose "best match minky" in the
lining drop down on the order page for the material you would like for the collar and then
in the notes for the collar tell me the product ID of the plushy you would like as a lining.