Best Friends Club, Ink. Yuko is one of the rarest of the retired BFC dolls. She can however still be found on Amazon and on secondary market sites like eBay. Yuko has long black hair and brown eyes. Her face mold is unique. BFC, Ink. dolls are frequently cited as being suitable for older kids and for adult collectors, due to their complex and possibly fragile, highly articulated 18" bodies. So be prepared to shell out around $100 for a new-condition Yuko, though her price can easily range in the $200s.