I'm sure this would stop anyone from buying from a pet store.

Here's a site of a Chihuahua rescue and transport. http://www.chihuahua-rescue.com/

Remember that when you buy from a pet store, you're gambling BIG TIME with their health and temperment. Would you rather pay double the price for a dog that may end up dying within it's first year with you because of it's poor health? Or, having a dog that has an unsteady temperment that will force you and your parents to give it up?

Explain to your parents that the strict adoption policies are only to ensure that dogs go to the best homes available for them and that your family gets the best possible match. They wouldn't want a dog that doesn't get along with kids to go to a home with 5 kids right? It's just to ensure that both the dog and the family will be happy together.