It's not rare...just in-demand. I've had it twice on red /silver writing, saw the orange one (styrene) for the first time on ebay the other day so that must be harder to get. Guess the white demo is hard too.
Like I said, it's not a rare record, it's on ebay every week, just like Soul Brothers Six.
In-demand.
Check out 'When Your Love Has Gone'...another great one from the man!