Woodpecker's has great grooming bands. They are usually a vendor at many of the shows in this area. They are latex bands, and are made to not break the hair.
Woodpeckers - Grooming supplies for the professional - 1-800-597-6342 The best size is M MW 5/16'', and they come in many colors (I get clear). You get 1000 for $12.00. Also, a tip: keep the bands in the refrigerator, and they will stay stronger longer. Latex breaks down over time and weakens, and keeping them refrigerated slows down the process.
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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.