So you might not have noticed, but I did take a quick weekend trip to Cape Town in January for the killer price of $750. I checked today and it looks like the fare is still available. This is a phenomenal deal for anyone looking to escape winter for a week. (Students, think Spring Break!)
The fare is valid on KLM, Air France, and Delta, through mid-March and there is availability for several days in March
Your best bet for finding the fare is to search on the ITA Matrix tool, using the month-long search and then book directly with KLM, Delta, or Air France.