AshRike,
I hate puppymills, too. Go to
Prisoners of Greed and you can find a lot of support information and material for fighting puppymills.
Also, you use this information to interest your local paper into doing an in-depth story on puppymills.
To find puppymills in your area, the "Prisoners" web site has the USDA registration lists of brokers and breeders by state. Most, if not all, of those are puppymills or brokers who purchase from puppymills for resale.
To find out if your local petstore sells pets from puppymills (a sure bet!), go to see a puppy and ask for it's provenence. Then check the USDA list to see if the broker/breeder is listed there. Don't whip out the list in the petstore but do write down the information on the dog.
CAUTION! Visiting petstores can cause extreme emotional anguish. It is 100% necessary that you NOT fall in their trap and purchase one of the puppies to "save" it. You are only dooming that puppy's parents to more breeding horror and rewarding the breeder and petstore financially for their exploitation and cruelty.