I had my first boerie roll at the Rother Valley Farm, South African day. They were selling boerewors as well as fresh meat and venison from their farm shop.
But they appear to have taken their websites down and am not sure whether they are still running it.
That leaves us with:
Mopani Trading who do Plaaswors at 10.99 a kg and Biltong & Bangers Traditional Wors at 11.50 . The chilli bites from Mopani at 60.00 a kg are also worth trying