It pays off, doesn't it? We returned to both of the nearby thrifts today. At one, I found five magazines for 10 rand (about $1), including one that's still on the news stands.
The other one was even better: a two-story garden of delights, including hundreds of records (all crap, though, according to Trevor), and zillions of books so organized there was even a section on ballet.
I found a huge jar of knitting needles and dumped them out to find four sets of DPNs, including one that I believe to be the perfect replacement for the set I brought to Zambia and promptly broke one of. Thrift magic!