As I understand it blue is one of the few colors not naturally found in serama.It has/had to be introduced by adding another breed usually OE.Then the bird is bred back to the standard by using the best seramas and the created blue serama till you have both the color and type.Jeff Summers I think in NC has them -I could have the name off a bit.I am off more than a bit
ClairedeLune is also the name of our D'uccle! Had to post that!! Hope you find some Serama. I have some great birds, but have a waiting list and not sure if you want to wait that long.
Just make sure you do your research, read this: https://www.backyardchickens.com/forum/viewtopic.php?id=170220
I have a pair of Seramas in blue- the roo is more of a blue birchen, and the hen is a blue laced. She is very pretty, color-wise. Type on both of them is not the best, but I think their off-spring will be quite nice. I have one chick from them now that I'm waiting to see what she ends up looking like, and more eggs in the bator. He is also mated with a very nice, typey, wheaten hen, so I am excited to see the outcome of their breeding.
I also have jap bantams and would love to breed the blues to them