If you are shopping for the right retail equip. pos/cash reg. supplies for a Omron RS 790, you're in the right place. Omron's family of Retail Equip. POS/Cash Reg. are known for their industry-leading print quality and efficiency and the Omron RS 790 is no different. Save money & time when you buy retail equip. pos/cash reg. supplies for Omron RS 790.