Filtrete 3M-22 7-Day Digital Programmable Thermostat for $17.95 shipped. Here is a screenshot for your reference. It features pre-set programming that can be modified to suit schedule and comfort level, with many options to accommodate temporary schedule changes and vacation time. It is compatible with systems including 1- and 2-stage heat and cooling, heat pumps with or without auxiliary heat, zoned baffle systems and 2- and 3-wire hot-water heaters.