Hi and welcome to BYC from northern Michigan 
LF lemon blues are uncommon, and many have poor type. There see a few breeders that are working on LF Brown Reds, which are nescessary for a true LB. In addition, there are people who are breeding buff - blue crosses and calling them LB's, so I would recommend caution before buying.
Here is the link to the LB thread. Near the end you will find some discussion on type, color and breeding.
https://www.backyardchickens.com/t/226606/lemon-blue-cochins-brand-new-pictures/470#post_10235509

LF lemon blues are uncommon, and many have poor type. There see a few breeders that are working on LF Brown Reds, which are nescessary for a true LB. In addition, there are people who are breeding buff - blue crosses and calling them LB's, so I would recommend caution before buying.
Here is the link to the LB thread. Near the end you will find some discussion on type, color and breeding.
https://www.backyardchickens.com/t/226606/lemon-blue-cochins-brand-new-pictures/470#post_10235509