As a committee mulls an ambitious and controversial "one bin" project that could overhaul recycling and waste collection in Houston, the city's traditional mode of getting rid of trash just got cheaper. A renegotiated contract with the city's primary waste hauler, approved by City Council late last month with little fanfare amid a deluge of end-of-year requests, is set to save the city about $600,000 annually, according to the city's Solid Waste Management Department.