www.petedge.com has sweaters and coats for a cheap price.
Also, try ebay. LOTS of dog clothes on there and you can get a good deal.
Walmart also has cheap sweaters. I saw a TON at the Walmart here
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~Magnifique Yorkies~
Purchasing from backyard breeders, pet shops, and puppymills perpetuates the suffering of other dogs.
Educate yourself and buy from reputable breeders or rescue.