Charged double the price!

Been looking for Gullon Twins Cocoa Sandwich Cookies Sugar Free 210g for a while now and finally found them at Dischem and Checkers. Something I do not understand is WHY ON EARTH Dischem charges R43.95 for the EXACT SAME cookies/size/brand when Checkers charges R21,99?! Dischem please explain this to me? You charge DOUBLE the price? Why?!

Looking forward to your response!