Alphabet Inc.'s Nest, seeking a bigger share of the connected home market, is developing a cheaper version of its flagship thermostat and new home security products, according to a person familiar with the matter. The company is working on a version of its "learning thermostat," which adjusts the temperature based on usage patterns, that would sell for under $200, the person said. The current version sells for $249. The cheaper model would include less expensive components and at least one internal prototype lacks the flagship model's metal edges, the person said.