Yorkies are more expensive than Maltese I think . . . find a good breeder that will provide you with a happy, healthy baby . . one that would at least guarantee you with no genetic defects . . .
I have 2 and other than shots and a few diahreas here and there at the beginning when they are still young and I was a newbie, I don't pay much anything on vet bills . . . .and I think that is because I ended up with both healthy babies
Good luck on your search.