What will stop me getting cash back? Using a promotional/coupon code not posted and approved by TopCashback. The purchase of Gift Cards, Laptops & Desktop computers, Tablets & E-Readers , Printers & Scanners, Phones, Cameras & Electronics, Fitness, Wearable Technology, Hard Drives & Data Storage are not eligible for cash back. HP:https://www.topcashback.com/staples/