Well done, you can count.
I dont believe for a minute that the price "pp-oz" is quoting includes all applicable duty and taxes. I would bet that they are being imported that same as via nengun, under the radar with the risk that they *may* get hit for duty and taxes.
Nengun has excellent buying power via HKS and Apexi etc, and im sure if someone took charge here and approached him about a group buy and had genuine interest, he would offer a great deal if a number of turbo orders were placed