Personally, I wouldn't buy a pup from a petstore. I go in and torture myself enough looking at em! And they are all from HORRID backgrounds. I would get a Cpl good Rescues and just have them come to the shop certain days of the week.
I was looking to get another dog to add to the Family. And I went to 4 different shelters in the area.. Looking for a Pittie.. or Bullie Breed. Only 2 of the 4 would adopt to me because I rent. Yes I could get another breed.. But, I wanted one that no one else wanted. And if my landlord OKs it, why couldn't I have one?? Well, I found me a Shar-Pei/Boxer/Pit mix. :-)

There has to be shelters out there trying to get there dogs seen. Good luck!