SAA having 72 hour sale IAD/JFK to JNB for $860 for travel before 11/30. Also seeing IAD to CPT for around $890. Not great, but not bad.
http://www.flysaa.com/cms/US/specials/72hours.html
edit: Economy Class Fare G - what does this mean for earning miles on partner airlines?
edit again: looks like its 50% miles...not such a great deal at all then