The price difference between a modernist cartridge type shaving blade like Gilette Mac-3 or Gilette Fusion and an "old school" double-edge one is phenomenal and mind-boggling. For example, this pack of 4 Mac-3 blades on Amazon costs a whopping Rs. 469 (~$6.7) whereas this DE blade pack of 50 pieces costs only Rs. 114 ($1.67)! Which means the cost per blade comes to Rs. 117 in case of former and only Rs. 2.28 in case of latter.