RUN! HSI Professional has the Ceramic Glider Heated Straightening Brush for only $40 shipped with coupon code GIVEHSI50 at checkout. (Reg. $129.99) This heated hairbrush actually works! It has an adjustable temperature of 350-450░F to suit your particular hair type and texture.áPlus, you’ll get a Free Bonus: 5ml Argan Oil Leave-In Treatment.