Besides for the shopping center, or places like African Trading Port at the V&A Waterfront, I've seen the people who make them selling these kind of beaded animals along the road.
Specifically, I've often seen them near the Tyger Valley shopping center and on the M3, at the Kirstenbosch traffic lights. That said, if you keep your eyes peeled you'll see many similar beaded animals for sale along the road all over the peninsula.