Grimspoon
The Hoff
Not to be a dick, but the disparity in pricing is quite shocking across the board :
Assassin's Creed Brotherhood
R319.95 vs R181
Brink
349.95 vs R279
Fallout New Vegas
R559.95 vs R348
The sad thing about this one, is the competitor's price is for the Complete edition, whereas the Kalahari version is the original release without the DLC.
Marvel vs Capcom 3
R478.95 vs R265
Once again, it should be noted that the competitor's price is for the most recent edition of the game, whereas the Kalahari version is the original version.
Saint's Row The Third
R307.95 vs R265
Shadows of the Damned
R400.95 vs R249
Super Street Fighter IV Arcade Edition
R233.95 vs R139
Warhammer 40k Space Marine
R281.95 vs R179
Also note, that all of these are currently in-stock items.
I have to agree with Strifehart here. There is absolutely nothing special about those prices especially when your direct competitor has them for significantly less. Ultimately people vote with their wallets.