rip-off

I went to buy small chips on the 29.05.2015 at 20:00 but only to find out that they only have regular Size at R20.90 instead of Pocket size chips at R10.90.<br> When i questioned why they can have big size but not small size, was told that after hours they only sell bigger size to finish up their stock. So what if i cant afford R20.90???