In my experience, maltese run much higher than $500...they seem to be priced similarly to yorkies.
I love Rhapsody Maltese in Texas.
www.rhapsodymaltese.com
Their males are quite a bit less expensive than their females. They have gorgeous dogs
Divinity Maltese in Texas is another breeder.
www.divinitymaltese.com
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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.