Update: You can also pick up Snow Joe Melt-2-Go Nature + Pet Friendly CMA Blended Ice Melter, 25-lb Bag for $11.10 shipped.
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Snow Joe Melt Calcium Chloride Crystals Ice Melter Resealable Bag, 25-Pound – Link

This is currently marked down on Amazon, to $13.04 w/ free shipping.

• Generates heat instantly upon contact with snow and ice-Melts down to -25 degrees Fahrenheit
• Convenient resealable bag for easy storage and extended shelf life
• Safe on sidewalks (when used as directed)-Lasts up to 24 hours for long lasting traction control
• Will not harm grass, wood, concrete, metals, or other vegetation when used as directed
• Never use any ice melt products on freshly poured concrete that has not had adequate time to cure