You can post him in the Rescue/Rehome forum here but he needs to be under $300 to qualify. My other suggestion would be to find a reputable rescue willing to take him and find him an appropriate home. There are Chi Rescues that would even be willing to work with him to make him into a much better pet. Is he neutered? That is something that you should consider before placing him into a new home. There is always the potential that he could be used for breeding in a mill and you sure don't want that to happen. Take a look here. There is also a sticky at the top of the Rescue Forum about rehome with tips.
Yorkie Rescues & New Homes Needed - YorkieTalk.com Forums - Yorkshire Terrier Community