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Those should be available at Home Depot or Lowes. The best thing to do would be to take a picture of what you're looking for and bring it with you when you ask them where it is.
If you want efficient heating look into rocket mass heaters. Burns 75 to 90% less "wood" product. Depending on your location you COULD heat your home all winter with either your junk mail or fallen limbs from trees in your own yard.