Davidgirl -- Since price seems to be your issue right now.....I would look into rescues a little more. What rescues have you contacted?
Here is a sticky with a list of rescue organizations & contact info:
http://www.yorkietalk.com/forums/yor...nizations.html
Also be sure to read the many homes needed in this thread:
Yorkie Rescues & New Homes Needed - YorkieTalk.com Forums - Yorkshire Terrier Community There is a girl in TN that could use a home! I know it is a little far from Chicago, but maybe a yorkie train could help with transportation. The important thing about rescues is to get your application in so they can research you and get you on the approved list, so when one comes available that is a good match for you -- you can be selected.
If you can't rescue, I would follow Steve's advice, don't take the cut-rate puppy that winds up costing thousands in vet fees. Look for a reputable breeder, as the ones in his link to you (in the first reply you received in this thread) -- if you cannot afford them, wait.