Gixxer 750 Japanese Tire

I took my Gixxer 750 in for an oil change. The back tire had a nail of all things. Now I've told the dealer to change both tires. But I had a nail in the rear. I was told that the Dunlp tire is really available only in Japan. That the dealer can order it but it will cost me $300.00. I can replace the front and the rear for 350.00 and that they have it in stock. Although I told the dealer to do this, I really don't have a choice, do you think this is true what I was told?

Note I'm not looking to go to some internet discount place and get one cheaper. On my Gixxer I don't want to skimp on tires..or really anything with safety.

Any opinions?