I have B/B Orps, but have orders for my chicks for the next month, as I sold my flock except a trio and a customer ordered all the chicks for a while!
Gumpsgirl, Bamachicken, and others have blue, black, and splash Orps, too- so I'm sure you will have luck finding them.
I would like to suggest you get more than one Silkie. She won't be able to roost with the others and will need a companion or two like her- it's just not the same without a pile of Silkies, anyway!!