My self and another contractor worked T&M for a smart Homeowner/builder a while back who provided us with a "gopher" who went to the store to buy materials when we ran out, bought us lunch, water bottles, cleaned up everything, helped us pull wire, etc. This owner showed up with ALL the light fixtures placed in the chosen locations when we started the finish electrical. We were working by the hour and he paid us every day. He got the job done under budget.