there is NO decent breeder out there that would sell to a pet store and have their pups put into a tiny box with a bunch of other dogs to pee and poo wherever they like.
I don't want to sound harsh, but if you buy a puppy from a pet store you are
DIRECTLY SUPPORTING the prolonged abuse and torture of that puppies parent and however many other dogs are suffering at the hands of that "breeder".
you say you aren't rich, but pet store dogs still go for a lot of money and have a higher chance of costing A LOT more in vet bills because of sicknesses that can surface later on in life from bad breeding. This in turn also directly affects the abandoned pet rates as many people send their dogs to shelters or rescues when the dog gets sick and they can't aford the pet bills.
PLEASE take your time to find a pup in need of a good home and love. there are sooo many dogs that did nothing wrong and need your love. it might take more time, but the reward of supplying love to someone that really needs it, and being able to hold your head up high knowing you did not support the disgusting world of puppymills is well worth it, in my opinion.
I have shared this link before and i will continue to share it... this is what goes on on a DAILY basis to thousands of abandoned pets a day. There is a "SAM" waiting for you...
MY NAME IS SAM