I looked at the Pitroad site just a couple of days back & the H150 LSD is still on the NLA list, the same as it was when I checked a year ago. I was hoping that with enough interest they might have gone back into limited production, but apparently not.
Supply & demand control the market value & supply seems to be almost zero.

The Ford 9" is the sort of thing that you use with engines over 400hp, with torque to match, & a heavy car, but unless you have this much power [or more] & plan on flogging the living bejesus out of it, then the mere though of using a 9" Ford rear end in a small Datsun is downright laughable as the only things you'll get are an empty wallet, a bad ride & a lower performance than your car deserves as these suckers weigh heaps & suck up more power to just turn them then you even want to think about.