Steri Stumpie Price Fluctuation

I buy my Steri Stumpies at Pnp, when the price is right that is.<br> <br> Why is it that in any given week the price changes as many as THREE times!? Anywhere from R6.50 to as much as R9.70 within a few days of each other. The milk price hasn't changed, other competing milkshake drinks prices don't budge., yet Steri Stumpie is on a regular rollercoaster! This is not a once in a while thing either. It's been happening for at least a year now.<br> <br> So why is it that Steri Stumpie prices change almost every week at least twice? Is it a Parmalat or PnP issue?<br> <br> Either way, when the prices are crazy I'm forced to buy a competing product which I'm sure \South Africa's Number One flavoured milk brand\" manufacturer does not want"