Amazon on Tuesday announced a wide expansion of its Dash Button on-touch retail sales program, despite indications of relatively low acceptance among its key base of Prime customers. The company added more than 50 retail products to its lineup of Dash thumb-drive size buttons, which let consumers reorder things like detergent and toilet tissue when their supply is getting low. "This expanded brand list is a result of Dash Button's growing popularity," said Amazon spokesperson Katie McFadzean.