Make an order of over £20 from Cruga and you will get a free 150g pack of Original Beef Biltong.
Delivery is also free for orders over £20.
Cruga do decent enough Jerky and Biltong with a reasonable selection too.
I've ordered from them before and been happy with the product and service.
Only problem was that over a kilogram of jerky was consumed by me in 24 hours after delivery last time!
They also do a range of other South African specialities.