If PBkingdom don't have em in stock, then most likely other stores wont have them either. Reason is because PBKingdom is the distributor for Macdev. I'd just call em up, and pre-order a ninja cyborg and wait until it arrives.
And also, it took me awhile to notice this, but you don't need the matchstik 7-piece kit, just get the 5-piece kit. Why you ask? It's because if you take a look at the 5-piece kit's description at PBkingdom it says:
"5 piece kit (3 bores (all Black color .683, .685, .693) , 2 tips Black Aluminum color (12” and 16") "
Now if you look closely, what's missing? The .689 back and 14" front. Hmm wonder where that is at.
It already came stock with the cyborg. Thus, go for a 5-piece and save yourself 20 bucks. If PBkingdom didn't tell me about this, I woulda had an extra front/back. Although...20 bucks for another spare barrel, not a bad deal at all either.