If Yorkie Haven does not work out try going to:
Petfinder.com - Animal Welfare Organizations Near You
The left hand side has a place to do a search for a rescue. While Yorkie Haven is an excellent rescue it is necessary to really check out rescues these days as some are not very reputable and can be scams. Pet finder is pretty good about who they put on there but you can't be too careful these days, especially when dealing with Yorkies.