Shalou if you're after a particular breed, why don't you try the local club for that type of dog? We got both our purebred Jack Russell Terriers after they had been dumped and rescued by the JR Club. They came desexed, vaccinated, wormed and vet-checked for $250.00. Not 'puppies', but one was only 12 mths old. Clubs will often have either formal rescue services for their breed, or will at least know of dogs that are unwanted, returned or otherwise need a home.

Personally, I think the Animal Shelters or RSPCA are well worth what you pay. Have you tried your local council pound as well? Once dogs have been there without being claimed for a certain amount of time I'm pretty sure they can rehome them. It's worth knowing what dog you're bringing home to your kids, and all of the options I've mentioned will have observed them very carefully to make sure they'd be suitable in a home like yours.