There is a dealer in the UK that I use called Provapes...here's a link...which does the SXK clone (this is a clone thread) and I can give you another supplier for the authentic if you wish...I have both
Billet Box & Spares
But nowhere does all the accessories for the BB because they are so diverse
The website above will get you started and the sxk kit itself comes with a Kanger rebuildable bridge and 2 other bridges...one for aspire coils and the other Kanger. So you're up and running straight away. You might want to get the vapeshell rebuildable...fantastic flavour. The BB is the one vape product I wish i'd got earlier...its a superb vape