Meatworld in Centurion have a large range of sauces.
They have imported a few of the Blair range and the hottest they had in stock was this one:
http://extremefood.com/Sudden-Death-Sauce/
Its R115, the milder ones they have in the range are R85. R115 is cheap considering the RRP is 10 usd, which is almost R130 these days.
I assume even their mild ones are lets rip open your intestines and rearrange them in no particular order.
From the reviews, you may have to use this with another type to supplement the heat with flavour: