www.barkindogclothes.com has cute PJs that are really cheap and include shipping. Also, most of the YT sellers sell the XXS clothes at a cheaper price than the bigger sizes. ChloeBella, Tinkerbell's Closet and Go.Fetch are all great and will make tiny sizes. I've seen some XXS's at Walmart too that are pretty small - I know they're really short anyway but might be too big around for her.
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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.