HSU was once available with Audire coimbatore but they stopped selling it log back.
Like another friend said, SVS is available for purchase online at htstore bangalore. However try to talk to the seller before placing the order as you may get some discount.
And for the best sub, I think the new HSU VTF15MK2 can match the PB13ultra and is also much cheap. The HSU ULS15mk2 may even outperform the SB13ultra in the midbass section.
But nothing can match the SVS's BILL OF RIGHTS: Support & Service | Your SVS Bill of Rights
which is not available to the Indian customers, too bad.