This is one of the most common sizes of Greymon plushies made by Play by Play and it does come up for sale quite a lot on eBay UK. Greymon is about 15cm in size. Looking to buy one? Check eBay UK and DE where they usually show up on. Last seen December 2019 on eBay UK. He was £30 to buy from a set of plushies.
Any questions just leave a comment down below.